In the search for worlds that could harbour life, proximity matters enormously. A planet that might be habitable but sits hundreds of light-years away may as well be unreachable for practical science — too far for detailed atmospheric studies, too faint for the instruments we have or will have for decades. GJ 3378b is different. At just 25 light-years from Earth, this newly confirmed super-Earth is practically a cosmic neighbour — and it sits in the habitable zone of its host star, where temperatures could theoretically allow liquid water to exist on its surface. ‘This one is exciting,’ said Dr. Paul Robertson of the University of California, Irvine, one of the lead researchers behind the discovery.&nbsp;What We Know About GJ 3378b&nbsp;GJ 3378b orbits a faint red dwarf star in the constellation Camelopardalis — the Giraffe — completing one full orbit every 21.45 days. The planet has a mass approximately 2.3 times that of Earth and a diameter roughly twice as large, placing it firmly in the super-Earth category: bigger and heavier than Earth, but not large enough to be a gas giant. Crucially, GJ 3378b receives about 90 percent of the solar radiation that Earth receives from the Sun — sitting close enough to the habitable zone's inner edge to be warm, but not so close as to be cooked. Its position in the habitable zone is not hypothetical or borderline. It is well within the range where liquid water is physically plausible.&nbsp;How It Was Found&nbsp;The discovery used two of the world's most sensitive spectrographs dedicated to finding planets around red dwarf stars. The Habitable-zone Planet Finder instrument on the Hobby-Eberly Telescope at McDonald Observatory in Texas and the NEID spectrometer on the WIYN Telescope at Kitt Peak National Observatory in Arizona both contributed data. The research team, led by Dr. Michael Endl of the University of Texas at Austin and Dr. Paul Robertson of UC Irvine, published their findings in the Astrophysical Journal in 2026 in a paper titled A Revised Mass and Period for the Habitable Zone super-Earth GJ 3378b: A Planet Straddling the Cosmic Shoreline.&nbsp;What The ‘Cosmic Shoreline’ Means&nbsp;The paper's subtitle — A Planet Straddling the Cosmic Shoreline — refers to a concept in planetary science used to distinguish worlds likely to retain an atmosphere from those that have had it stripped away by stellar radiation. On one side of the shoreline are planets with enough gravity and protection from their star's radiation to hold onto an atmosphere. On the other side are bare, airless rocks. GJ 3378b sits right on that boundary — massive enough to potentially hold an atmosphere, but exposed enough to its red dwarf host that the outcome is far from certain. This is precisely what makes it both exciting and uncertain.&nbsp;The Red Dwarf Problem&nbsp;Red dwarf stars are the most common type of star in the Milky Way, and many of the closest potentially habitable planets discovered so far orbit them. But red dwarfs come with a serious hazard: they are far more magnetically active than the Sun, particularly in their early lives. They emit powerful bursts of ultraviolet and X-ray radiation called stellar flares, and they drive intense stellar winds that can erode a planet's atmosphere over geological timescales. For GJ 3378b, the key question is whether its 2.3-Earth-mass bulk provides enough gravitational grip to hold onto an atmosphere despite billions of years of bombardment from its host star. No current instrument can answer that question with certainty.&nbsp;Why 25 Light-Years Matters&nbsp;Most potentially habitable exoplanets discovered so far orbit stars that are hundreds or thousands of light-years away — far enough that detailed atmospheric characterisation is essentially impossible with any telescope currently in operation or under construction. At 25 light-years, GJ 3378b is different. It is close enough to be a genuine near-term target for atmospheric study. The James Webb Space Telescope may be able to obtain some spectroscopic data on the planet's atmosphere, though red dwarf planetary atmospheres are notoriously difficult to study even with Webb. The real opportunity will come with NASA's planned Habitable Worlds Observatory, an extremely large space telescope expected to launch sometime in the 2040s, which is specifically designed to directly image rocky planets around nearby stars and analyse their atmospheric chemistry for signs of biological activity.&nbsp;The Nearest Candidates Keep Getting Closer&nbsp;GJ 3378b joins a short but growing list of potentially habitable worlds within striking distance of our solar system. Proxima Centauri b, orbiting the nearest star to the Sun at just 4.2 light-years, is another candidate — though its habitability is equally contested due to its red dwarf host's activity. The consistent finding of habitable-zone planets around nearby red dwarfs suggests that such worlds may be extraordinarily common in our galactic neighbourhood. Whether any of them actually harbour life — or even stable atmospheres — remains the central question that the next generation of telescopes will be built to answer. For now, GJ 3378b is one of the best places to start looking.

GJ 3378b is a super-Earth 25 light-years away orbiting in its red dwarf star's habitable zone. Mass 2.3x Earth, orbit 21.45 days. Researchers call it one of the most exciting nearby exoplanets found.

In the search for worlds that could harbour life, proximity matters enormously. A planet that might be habitable but sits hundreds of light-years away may as well be unreachable for practical science — too far for detailed atmospheric studies, too faint for the instruments we have or will have for decades. GJ 3378b is different. At just 25 light-years from Earth, this newly confirmed super-Earth is practically a cosmic neighbour — and it sits in the habitable zone of its host star, where temperatures could theoretically allow liquid water to exist on its surface. ‘This one is exciting,’ said Dr. Paul Robertson of the University of California, Irvine, one of the lead researchers behind the discovery. What We Know About GJ 3378b GJ 3378b orbits a faint red dwarf star in the constellation Camelopardalis — the Giraffe — completing one full orbit every 21.45 days. The planet has a mass approximately 2.3 times that of Earth and a diameter roughly twice as large, placing it firmly in the super-Earth category: bigger and heavier than Earth, but not large enough to be a gas giant. Crucially, GJ 3378b receives about 90 percent of the solar radiation that Earth receives from the Sun — sitting close enough to the habitable zone's inner edge to be warm, but not so close as to be cooked. Its position in the habitable zone is not hypothetical or borderline. It is well within the range where liquid water is physically plausible. How It Was Found The discovery used two of the world's most sensitive spectrographs dedicated to finding planets around red dwarf stars. The Habitable-zone Planet Finder instrument on the Hobby-Eberly Telescope at McDonald Observatory in Texas and the NEID spectrometer on the WIYN Telescope at Kitt Peak National Observatory in Arizona both contributed data. The research team, led by Dr. Michael Endl of the University of Texas at Austin and Dr. Paul Robertson of UC Irvine, published their findings in the Astrophysical Journal in 2026 in a paper titled A Revised Mass and Period for the Habitable Zone super-Earth GJ 3378b: A Planet Straddling the Cosmic Shoreline. What The ‘Cosmic Shoreline’ Means The paper's subtitle — A Planet Straddling the Cosmic Shoreline — refers to a concept in planetary science used to distinguish worlds likely to retain an atmosphere from those that have had it stripped away by stellar radiation. On one side of the shoreline are planets with enough gravity and protection from their star's radiation to hold onto an atmosphere. On the other side are bare, airless rocks. GJ 3378b sits right on that boundary — massive enough to potentially hold an atmosphere, but exposed enough to its red dwarf host that the outcome is far from certain. This is precisely what makes it both exciting and uncertain. The Red Dwarf Problem Red dwarf stars are the most common type of star in the Milky Way, and many of the closest potentially habitable planets discovered so far orbit them. But red dwarfs come with a serious hazard: they are far more magnetically active than the Sun, particularly in their early lives. They emit powerful bursts of ultraviolet and X-ray radiation called stellar flares, and they drive intense stellar winds that can erode a planet's atmosphere over geological timescales. For GJ 3378b, the key question is whether its 2.3-Earth-mass bulk provides enough gravitational grip to hold onto an atmosphere despite billions of years of bombardment from its host star. No current instrument can answer that question with certainty. Why 25 Light-Years Matters Most potentially habitable exoplanets discovered so far orbit stars that are hundreds or thousands of light-years away — far enough that detailed atmospheric characterisation is essentially impossible with any telescope currently in operation or under construction. At 25 light-years, GJ 3378b is different. It is close enough to be a genuine near-term target for atmospheric study. The James Webb Space Telescope may be able to obtain some spectroscopic data on the planet's atmosphere, though red dwarf planetary atmospheres are notoriously difficult to study even with Webb. The real opportunity will come with NASA's planned Habitable Worlds Observatory, an extremely large space telescope expected to launch sometime in the 2040s, which is specifically designed to directly image rocky planets around nearby stars and analyse their atmospheric chemistry for signs of biological activity. The Nearest Candidates Keep Getting Closer GJ 3378b joins a short but growing list of potentially habitable worlds within striking distance of our solar system. Proxima Centauri b, orbiting the nearest star to the Sun at just 4.2 light-years, is another candidate — though its habitability is equally contested due to its red dwarf host's activity. The consistent finding of habitable-zone planets around nearby red dwarfs suggests that such worlds may be extraordinarily common in our galactic neighbourhood. Whether any of them actually harbour life — or even stable atmospheres — remains the central question that the next generation of telescopes will be built to answer. For now, GJ 3378b is one of the best places to start looking.

Astronomers have discovered a super-Earth orbiting a red dwarf star just 25 light-years away — one of the closest potentially habitable worlds ever found. The planet, GJ 3378b, sits squarely in its star's habitable zone, receives about 90 percent of the solar radiation Earth does, and has a mass roughly 2.3 times that of Earth. The catch: its star is a red dwarf, and those are some of the most dangerous hosts in the galaxy.

'25 light-years away': Scientists discover a potentially habitable planet near our solar system

When a star dies, it does not go quietly. A Sun-like star in its final phase swells into a red giant, expanding to hundreds of times its original size and incinerating everything in its inner system. Then it sheds its outer layers entirely, leaving behind a white dwarf — a dense, Earth-sized remnant of the original star, cooling slowly over billions of years. Any planet that was close enough to be engulfed by the red giant is gone. The conventional wisdom was that whatever survived a star's death must have been far enough away to escape that expansion. Then astronomers found WD 1856b — a planet as large as Jupiter, orbiting its dead white dwarf host every 34 hours at a distance of less than three million kilometres — and the conventional wisdom needed revising.&nbsp;The Planet That Should Not Be Where It Is&nbsp;WD 1856b was first detected in 2020 using NASA's Transiting Exoplanet Survey Satellite and the Spitzer Space Telescope. Even then, the discovery was deeply puzzling. The planet is enormous — between four and eleven times the mass of Jupiter, with a radius roughly eight times that of its white dwarf host, which is only about the size of Earth. When it transits in front of the dead star, it blocks a staggering 56 percent of the star's light — one of the highest transit depths ever recorded. And it is orbiting at an extraordinarily tight distance: less than three million kilometres from the white dwarf, completing a full orbit in just 1.4 days. The immediate question was how a planet that large could be orbiting that close to a star that had, billions of years ago, expanded into a red giant large enough to have destroyed anything in that region.&nbsp;James Webb Telescope Finds The Answer&nbsp;A new study published in the journal Nature on July 1, 2026 has used the James Webb Space Telescope to analyse WD 1856b's atmosphere for the first time, providing the data needed to finally understand the planet's history. The research team, led by Christopher O'Connor of Northwestern University's Centre for Interdisciplinary Exploration and Research in Astrophysics and Ryan J. MacDonald of the University of St Andrews in Scotland, found that WD 1856b's atmospheric chemistry, mass, and thermal properties tell a specific story — one that was not what most astronomers expected.&nbsp;It Did Not Survive The Red Giant. It Arrived Later&nbsp;The key finding of the 2026 study overturns the most intuitive explanation for WD 1856b's presence. The planet did not survive the red giant phase by being close to the star. It was not there during the red giant phase at all. Instead, WD 1856b originally orbited its host star from a much greater distance — far enough to be safe when the star expanded and died. It was only afterwards, between three and five and a half billion years after the white dwarf formed, that the planet gradually migrated inward to its current orbit through gravitational interactions with other objects in the system. The planet did not outlast the star's death. It moved in after the worst was already over.&nbsp;Tidal Heating Explains The Temperature Mystery&nbsp;One of the clues that pointed researchers toward the migration theory is WD 1856b's temperature. The planet registers at around 400 Kelvin — warmer than it should be given its distance from a cooling white dwarf that generates very little heat. The explanation lies in the physics of orbital migration: as the planet spiralled inward over billions of years, tidal forces — the same gravitational stretching that makes Earth's oceans bulge toward the Moon — generated heat inside the planet's interior. That residual tidal heating is still warming WD 1856b today, producing a thermal signature that the James Webb Space Telescope could detect and that matched the migration timeline.&nbsp;What It Means For Our Solar System's Future&nbsp;The Sun will run out of fuel and begin its red giant phase in approximately five billion years. When it does, Mercury, Venus, and Earth will almost certainly be consumed. Jupiter and Saturn, orbiting much farther out, will likely survive the expansion. What WD 1856b demonstrates is what could happen next: after the Sun collapses into a white dwarf, the surviving outer planets may not simply continue orbiting as they do today. Gravitational dynamics could cause them to migrate inward over billions of subsequent years, eventually ending up in orbits far closer to the white dwarf remnant than they occupy today — just as WD 1856b did. The solar system's final chapter, it turns out, may look considerably more eventful than a quiet slow cooling.&nbsp;A New Window Into Dead Star Systems&nbsp;Beyond the fate of our own solar system, WD 1856b matters because it is the first confirmed giant planet orbiting a white dwarf for which a detailed atmospheric and thermal analysis has been possible. White dwarfs are abundant — the vast majority of Sun-like stars in the galaxy will eventually become them — but the planetary systems surrounding them have been difficult to study. WD 1856b, at 80 light-years from Earth and with its dramatic 56-percent transit depth, offers the clearest view yet of what those post-stellar systems look like and how they evolve. The James Webb Space Telescope, with its ability to analyse planetary atmospheres in unprecedented detail, is expected to find more systems like it — giving astronomers a growing catalogue of planets that survived, or arrived after, the deaths of their stars.

A Jupiter-sized planet orbits a dead white dwarf 80 light-years away. A 2026 Nature study using JWST found it didn't survive the red giant — it miated inward billions of years later.

When a star dies, it does not go quietly. A Sun-like star in its final phase swells into a red giant, expanding to hundreds of times its original size and incinerating everything in its inner system. Then it sheds its outer layers entirely, leaving behind a white dwarf — a dense, Earth-sized remnant of the original star, cooling slowly over billions of years. Any planet that was close enough to be engulfed by the red giant is gone. The conventional wisdom was that whatever survived a star's death must have been far enough away to escape that expansion. Then astronomers found WD 1856b — a planet as large as Jupiter, orbiting its dead white dwarf host every 34 hours at a distance of less than three million kilometres — and the conventional wisdom needed revising. The Planet That Should Not Be Where It Is WD 1856b was first detected in 2020 using NASA's Transiting Exoplanet Survey Satellite and the Spitzer Space Telescope. Even then, the discovery was deeply puzzling. The planet is enormous — between four and eleven times the mass of Jupiter, with a radius roughly eight times that of its white dwarf host, which is only about the size of Earth. When it transits in front of the dead star, it blocks a staggering 56 percent of the star's light — one of the highest transit depths ever recorded. And it is orbiting at an extraordinarily tight distance: less than three million kilometres from the white dwarf, completing a full orbit in just 1.4 days. The immediate question was how a planet that large could be orbiting that close to a star that had, billions of years ago, expanded into a red giant large enough to have destroyed anything in that region. James Webb Telescope Finds The Answer A new study published in the journal Nature on July 1, 2026 has used the James Webb Space Telescope to analyse WD 1856b's atmosphere for the first time, providing the data needed to finally understand the planet's history. The research team, led by Christopher O'Connor of Northwestern University's Centre for Interdisciplinary Exploration and Research in Astrophysics and Ryan J. MacDonald of the University of St Andrews in Scotland, found that WD 1856b's atmospheric chemistry, mass, and thermal properties tell a specific story — one that was not what most astronomers expected. It Did Not Survive The Red Giant. It Arrived Later The key finding of the 2026 study overturns the most intuitive explanation for WD 1856b's presence. The planet did not survive the red giant phase by being close to the star. It was not there during the red giant phase at all. Instead, WD 1856b originally orbited its host star from a much greater distance — far enough to be safe when the star expanded and died. It was only afterwards, between three and five and a half billion years after the white dwarf formed, that the planet gradually migrated inward to its current orbit through gravitational interactions with other objects in the system. The planet did not outlast the star's death. It moved in after the worst was already over. Tidal Heating Explains The Temperature Mystery One of the clues that pointed researchers toward the migration theory is WD 1856b's temperature. The planet registers at around 400 Kelvin — warmer than it should be given its distance from a cooling white dwarf that generates very little heat. The explanation lies in the physics of orbital migration: as the planet spiralled inward over billions of years, tidal forces — the same gravitational stretching that makes Earth's oceans bulge toward the Moon — generated heat inside the planet's interior. That residual tidal heating is still warming WD 1856b today, producing a thermal signature that the James Webb Space Telescope could detect and that matched the migration timeline. What It Means For Our Solar System's Future The Sun will run out of fuel and begin its red giant phase in approximately five billion years. When it does, Mercury, Venus, and Earth will almost certainly be consumed. Jupiter and Saturn, orbiting much farther out, will likely survive the expansion. What WD 1856b demonstrates is what could happen next: after the Sun collapses into a white dwarf, the surviving outer planets may not simply continue orbiting as they do today. Gravitational dynamics could cause them to migrate inward over billions of subsequent years, eventually ending up in orbits far closer to the white dwarf remnant than they occupy today — just as WD 1856b did. The solar system's final chapter, it turns out, may look considerably more eventful than a quiet slow cooling. A New Window Into Dead Star Systems Beyond the fate of our own solar system, WD 1856b matters because it is the first confirmed giant planet orbiting a white dwarf for which a detailed atmospheric and thermal analysis has been possible. White dwarfs are abundant — the vast majority of Sun-like stars in the galaxy will eventually become them — but the planetary systems surrounding them have been difficult to study. WD 1856b, at 80 light-years from Earth and with its dramatic 56-percent transit depth, offers the clearest view yet of what those post-stellar systems look like and how they evolve. The James Webb Space Telescope, with its ability to analyse planetary atmospheres in unprecedented detail, is expected to find more systems like it — giving astronomers a growing catalogue of planets that survived, or arrived after, the deaths of their stars.

Eighty light-years from Earth, a Jupiter-sized planet is orbiting the corpse of a dead star — completing a full orbit every 34 hours, blocking more than half the star's light with its enormous bulk, and somehow still intact billions of years after its host star collapsed. A new study published in Nature in 2026 using the James Webb Space Telescope has finally explained how it got there — and the answer is stranger than anyone predicted.

'80 light-years away': This planet watched its star die and yet it survived

When NASA launched the Transiting Exoplanet Survey Satellite in April 2018, the mission's goal was straightforward: scan the sky for planets orbiting nearby stars by detecting the tiny dips in starlight that occur when a planet passes in front of its host. Eight years and billions of data points later, TESS has become something considerably more than its original brief. Its archive holds nearly 8,000 candidate exoplanets, nearly 900 of which have been confirmed. It has found worlds orbiting two stars simultaneously, planets being actively destroyed by their host stars, ultra-hot Jupiters completing full orbits in under a day, and — as of a study published in The Astrophysical Journal Letters on July 1, 2026 — the first planet ever detected by TESS using gravitational microlensing, a completely different detection method that opens an entirely new class of world to the telescope's gaze.&nbsp;What TESS Does And How It Works&nbsp;TESS surveys the sky in sectors, spending roughly 27 days staring at a patch of the sky before moving on. Its primary method is the transit technique: when a planet passes between its star and TESS's camera, the star appears fractionally dimmer. The depth and timing of those dips reveal the planet's size and orbital period. It is an elegant method, but it has a limitation — it only works for planets whose orbits are aligned just right to pass in front of their star from TESS's perspective. The vast majority of planets are invisible to this approach. The 2026 findings suggest TESS has been detecting them anyway — through methods that were never its primary purpose.&nbsp;The First Microlensing Planet In TESS Data&nbsp;The headline discovery from the July 2026 study is Gaia23bra b — a super-Jupiter approximately 1.63 times the mass of Jupiter, orbiting an orange dwarf star at a distance similar to Jupiter's orbit around the Sun. What makes this planet extraordinary is how it was found. TESS detected it not through a transit, but through gravitational microlensing — the bending of light from a background star by the gravity of the planet's host star and the planet itself. Less than five percent of all known exoplanets have been found this way, and TESS was not designed to do it. Lead author Mallory Harris, a doctoral candidate at the University of New Mexico, described the discovery as a case study in what happens when you look carefully at data collected for one purpose and find it is recording something entirely different.&nbsp;AI Is Finding 10,000 Hidden Planets In The Archive&nbsp;The microlensing discovery is not the only secret TESS has been keeping. Researchers applying machine learning to the telescope's eight-year archive have found 10,091 candidate planets that had never been identified through conventional analysis — new worlds hiding in data that had already been processed and set aside. A separate AI study confirmed over 100 exoplanets from the TESS archive, including 31 that had never previously been catalogued. Among these were rare and extreme examples: planets with orbital periods of less than one Earth day, worlds in the habitable zones of their stars where liquid water might exist, and planets with characteristics that do not fit neatly into existing classification systems.&nbsp;Worlds That Should Not Exist — But Do&nbsp;Part of what has made the TESS archive so productive for AI-driven searches is the sheer diversity of what it has captured. The telescope has found planets being torn apart by the tidal forces of their host stars, their atmospheres being stripped away in real time. It has found circumbinary planets — worlds orbiting not one but two stars — a configuration that was once thought too dynamically unstable to host stable orbits. It has found a planet orbiting a star using ripples in space-time as the detection mechanism, and it has found planets with volcanic activity implied by their surface temperatures and orbital geometry. The range of planetary environments in the TESS data has consistently surprised researchers who expected the galaxy to be more uniform than it is.&nbsp;What The Nancy Grace Roman Telescope Will Do Next&nbsp;The TESS microlensing discovery is also significant as a preview of what NASA's next major space telescope will accomplish. The Nancy Grace Roman Space Telescope, expected to launch in autumn 2026, is specifically designed for large-scale microlensing surveys and is projected to detect approximately 1,000 microlensing planets — compared to the handful identified in eight years of TESS data. The Roman telescope's discovery of Gaia23bra b in the TESS archive provides a critical methodological template: it demonstrates exactly how microlensing signals look in TESS data, which will help researchers identify and verify similar signals in Roman's far larger dataset.&nbsp;Eight Years Of Data, Decades Of Science To Come&nbsp;TESS is still operating. Every 27 days it moves to a new patch of sky, adding more data to an archive that researchers expect will take decades to fully mine. The confirmation that AI tools can extract thousands of previously unknown planet candidates from data that was thought to have been thoroughly analysed suggests that the most important discoveries from TESS may not have happened yet. As one team of researchers described it, the telescope's archive is not a finished record — it is an ongoing source of surprises. With nearly 8,000 candidates already identified and thousands more potentially buried in processed data, TESS's eight years of sky-watching appear to be just the beginning of what it has to tell us.

NASA's TESS telescope has 8 years of data hiding thousands of undiscovered planets. AI found 10,091 new candidates. A 2026 study found the first microlensing planet in TESS data. Full breakdown.

When NASA launched the Transiting Exoplanet Survey Satellite in April 2018, the mission's goal was straightforward: scan the sky for planets orbiting nearby stars by detecting the tiny dips in starlight that occur when a planet passes in front of its host. Eight years and billions of data points later, TESS has become something considerably more than its original brief. Its archive holds nearly 8,000 candidate exoplanets, nearly 900 of which have been confirmed. It has found worlds orbiting two stars simultaneously, planets being actively destroyed by their host stars, ultra-hot Jupiters completing full orbits in under a day, and — as of a study published in The Astrophysical Journal Letters on July 1, 2026 — the first planet ever detected by TESS using gravitational microlensing, a completely different detection method that opens an entirely new class of world to the telescope's gaze. What TESS Does And How It Works TESS surveys the sky in sectors, spending roughly 27 days staring at a patch of the sky before moving on. Its primary method is the transit technique: when a planet passes between its star and TESS's camera, the star appears fractionally dimmer. The depth and timing of those dips reveal the planet's size and orbital period. It is an elegant method, but it has a limitation — it only works for planets whose orbits are aligned just right to pass in front of their star from TESS's perspective. The vast majority of planets are invisible to this approach. The 2026 findings suggest TESS has been detecting them anyway — through methods that were never its primary purpose. The First Microlensing Planet In TESS Data The headline discovery from the July 2026 study is Gaia23bra b — a super-Jupiter approximately 1.63 times the mass of Jupiter, orbiting an orange dwarf star at a distance similar to Jupiter's orbit around the Sun. What makes this planet extraordinary is how it was found. TESS detected it not through a transit, but through gravitational microlensing — the bending of light from a background star by the gravity of the planet's host star and the planet itself. Less than five percent of all known exoplanets have been found this way, and TESS was not designed to do it. Lead author Mallory Harris, a doctoral candidate at the University of New Mexico, described the discovery as a case study in what happens when you look carefully at data collected for one purpose and find it is recording something entirely different. AI Is Finding 10,000 Hidden Planets In The Archive The microlensing discovery is not the only secret TESS has been keeping. Researchers applying machine learning to the telescope's eight-year archive have found 10,091 candidate planets that had never been identified through conventional analysis — new worlds hiding in data that had already been processed and set aside. A separate AI study confirmed over 100 exoplanets from the TESS archive, including 31 that had never previously been catalogued. Among these were rare and extreme examples: planets with orbital periods of less than one Earth day, worlds in the habitable zones of their stars where liquid water might exist, and planets with characteristics that do not fit neatly into existing classification systems. Worlds That Should Not Exist — But Do Part of what has made the TESS archive so productive for AI-driven searches is the sheer diversity of what it has captured. The telescope has found planets being torn apart by the tidal forces of their host stars, their atmospheres being stripped away in real time. It has found circumbinary planets — worlds orbiting not one but two stars — a configuration that was once thought too dynamically unstable to host stable orbits. It has found a planet orbiting a star using ripples in space-time as the detection mechanism, and it has found planets with volcanic activity implied by their surface temperatures and orbital geometry. The range of planetary environments in the TESS data has consistently surprised researchers who expected the galaxy to be more uniform than it is. What The Nancy Grace Roman Telescope Will Do Next The TESS microlensing discovery is also significant as a preview of what NASA's next major space telescope will accomplish. The Nancy Grace Roman Space Telescope, expected to launch in autumn 2026, is specifically designed for large-scale microlensing surveys and is projected to detect approximately 1,000 microlensing planets — compared to the handful identified in eight years of TESS data. The Roman telescope's discovery of Gaia23bra b in the TESS archive provides a critical methodological template: it demonstrates exactly how microlensing signals look in TESS data, which will help researchers identify and verify similar signals in Roman's far larger dataset. Eight Years Of Data, Decades Of Science To Come TESS is still operating. Every 27 days it moves to a new patch of sky, adding more data to an archive that researchers expect will take decades to fully mine. The confirmation that AI tools can extract thousands of previously unknown planet candidates from data that was thought to have been thoroughly analysed suggests that the most important discoveries from TESS may not have happened yet. As one team of researchers described it, the telescope's archive is not a finished record — it is an ongoing source of surprises. With nearly 8,000 candidates already identified and thousands more potentially buried in processed data, TESS's eight years of sky-watching appear to be just the beginning of what it has to tell us.

NASA's TESS telescope has been staring at the sky for eight years, and scientists are only now beginning to understand how much it has recorded. With nearly 8,000 candidate exoplanets found, AI tools uncovering over 10,000 more hidden in its archive, and the first-ever microlensing planet discovered in its data in 2026, TESS has become one of the most productive science machines ever built and researchers say the biggest discoveries may still be buried in its data.

'8,000 candidate exoplanets': NASA's TESS is hiding mind-boggling space secrets in its 8-year data

In the catalogue of strange worlds beyond our solar system, hot Jupiters occupy a special category of the bizarre. These are gas giants the size of Jupiter or larger that orbit their host stars in a matter of days — so close that their surface temperatures can exceed thousands of degrees. Astronomers thought they had a fairly good handle on how these planets behave. Then they looked more closely at CoRoT-2 b, and the rulebook turned out to be wrong.&nbsp;A Planet That Should Not Exist As It Does&nbsp;CoRoT-2 b sits 696 light-years from Earth. It is a hulking world — 3.5 times the mass of Jupiter and 1.5 times its size — that races around its host star in just 41 hours, completing a full orbit in under two Earth days. By the standards of hot Jupiters, this makes it an extreme but not unusual example of its type. What makes CoRoT-2 b extraordinary is what its atmosphere is doing. On every other hot Jupiter astronomers have studied, the planet's hottest point — its thermal hotspot — is displaced slightly in the direction the planet orbits. Winds in the upper atmosphere carry heat from the blazing dayside in the direction of the planet's motion, and the hotspot follows. On CoRoT-2 b, the hotspot is displaced in the opposite direction entirely. It is, by every model astronomers have, in the wrong place.&nbsp;What A Hot Jupiter Should Look Like&nbsp;To understand why this is so puzzling, it helps to understand what makes hot Jupiters tick. Because they orbit so close to their stars, most hot Jupiters are tidally locked — the same hemisphere always faces the star, just as the same side of the Moon always faces Earth. The dayside bakes under constant stellar radiation while the nightside stays cold. Powerful atmospheric winds, driven by this extreme temperature difference, flow from the hot dayside to the cooler nightside. These winds drag the peak heat — the hotspot — slightly ahead of the subsolar point in the direction of the planet's orbit. This pattern has been observed consistently across dozens of hot Jupiters. CoRoT-2 b was supposed to follow the same pattern. It does not.&nbsp;The Very Large Telescope Reveals The Clue&nbsp;New observations from the Very Large Telescope at the European Southern Observatory have given astronomers their best clue yet about what is happening on CoRoT-2 b. The data reveals that this hot Jupiter is rotating unusually slowly — far slower than any other hot Jupiter yet studied. One full rotation of CoRoT-2 b takes approximately three Earth days. But the planet's year — the time it takes to complete one orbit of its star — is just 1.7 days. In other words, CoRoT-2 b orbits its star twice before it has finished spinning once on its own axis. This is the opposite of what most hot Jupiters do, and it appears to be the key to why the hotspot ends up in the wrong place. The findings were presented at the 248th meeting of the American Astronomical Society in Pasadena, California, in June 2026.&nbsp;Why Slow Rotation Changes Everything&nbsp;In a standard tidally locked hot Jupiter, the winds flowing from the dayside to the nightside are what determine where the hotspot sits. But when a planet is rotating more slowly than it orbits, the atmospheric dynamics change in fundamental ways. The Coriolis forces that shape wind patterns — the same forces that create cyclones and trade winds on Earth — behave differently when the planet's rotation rate is out of step with its orbital speed. Instead of atmospheric winds carrying heat forward in the direction of the orbit, they can be deflected backward, dragging the hotspot in the opposite direction. This is the leading hypothesis that researchers have settled on to explain CoRoT-2 b's backwards atmosphere — and it is unlike anything observed on another planet in or out of our solar system.&nbsp;A Window Into Planetary Diversity&nbsp;The significance of CoRoT-2 b goes beyond one anomalous planet. Hot Jupiters were once considered among the best-understood class of exoplanets precisely because their extreme properties made them easy to observe and their behaviour seemed predictable. CoRoT-2 b suggests that even within this well-studied category, the range of possible atmospheric behaviours is wider than models have accounted for. If slow rotation can produce a backwards hotspot on one hot Jupiter, there may be other worlds with similarly unusual rotation states that have been misinterpreted or overlooked in existing data. The researchers behind this work have described the pleasure of studying planetary exceptions — finding worlds that do not fit the standard picture and working out why. CoRoT-2 b, it turns out, is one of the most instructive exceptions yet found.&nbsp;What Comes Next&nbsp;Follow-up observations of CoRoT-2 b are expected to further probe the planet's atmospheric structure and test the slow-rotation hypothesis against competing explanations. The Very Large Telescope's spectroscopic capabilities allow researchers to map temperature distributions across the planet's visible disc, building a more detailed picture of where heat is concentrated and how it moves. Whether the slow rotation explanation holds up or gives way to something more surprising, CoRoT-2 b has already done what the best scientific anomalies do: it has forced astronomers to look at a class of well-studied objects and ask whether they fully understand them. The answer, at least for now, appears to be no.

CoRoT-2 b is a hot Jupiter 696 light-years away whose thermal hotspot is shifted in the wrong direction. New VLT data suggests the reason is its unusually slow rotation.

In the catalogue of strange worlds beyond our solar system, hot Jupiters occupy a special category of the bizarre. These are gas giants the size of Jupiter or larger that orbit their host stars in a matter of days — so close that their surface temperatures can exceed thousands of degrees. Astronomers thought they had a fairly good handle on how these planets behave. Then they looked more closely at CoRoT-2 b, and the rulebook turned out to be wrong. A Planet That Should Not Exist As It Does CoRoT-2 b sits 696 light-years from Earth. It is a hulking world — 3.5 times the mass of Jupiter and 1.5 times its size — that races around its host star in just 41 hours, completing a full orbit in under two Earth days. By the standards of hot Jupiters, this makes it an extreme but not unusual example of its type. What makes CoRoT-2 b extraordinary is what its atmosphere is doing. On every other hot Jupiter astronomers have studied, the planet's hottest point — its thermal hotspot — is displaced slightly in the direction the planet orbits. Winds in the upper atmosphere carry heat from the blazing dayside in the direction of the planet's motion, and the hotspot follows. On CoRoT-2 b, the hotspot is displaced in the opposite direction entirely. It is, by every model astronomers have, in the wrong place. What A Hot Jupiter Should Look Like To understand why this is so puzzling, it helps to understand what makes hot Jupiters tick. Because they orbit so close to their stars, most hot Jupiters are tidally locked — the same hemisphere always faces the star, just as the same side of the Moon always faces Earth. The dayside bakes under constant stellar radiation while the nightside stays cold. Powerful atmospheric winds, driven by this extreme temperature difference, flow from the hot dayside to the cooler nightside. These winds drag the peak heat — the hotspot — slightly ahead of the subsolar point in the direction of the planet's orbit. This pattern has been observed consistently across dozens of hot Jupiters. CoRoT-2 b was supposed to follow the same pattern. It does not. The Very Large Telescope Reveals The Clue New observations from the Very Large Telescope at the European Southern Observatory have given astronomers their best clue yet about what is happening on CoRoT-2 b. The data reveals that this hot Jupiter is rotating unusually slowly — far slower than any other hot Jupiter yet studied. One full rotation of CoRoT-2 b takes approximately three Earth days. But the planet's year — the time it takes to complete one orbit of its star — is just 1.7 days. In other words, CoRoT-2 b orbits its star twice before it has finished spinning once on its own axis. This is the opposite of what most hot Jupiters do, and it appears to be the key to why the hotspot ends up in the wrong place. The findings were presented at the 248th meeting of the American Astronomical Society in Pasadena, California, in June 2026. Why Slow Rotation Changes Everything In a standard tidally locked hot Jupiter, the winds flowing from the dayside to the nightside are what determine where the hotspot sits. But when a planet is rotating more slowly than it orbits, the atmospheric dynamics change in fundamental ways. The Coriolis forces that shape wind patterns — the same forces that create cyclones and trade winds on Earth — behave differently when the planet's rotation rate is out of step with its orbital speed. Instead of atmospheric winds carrying heat forward in the direction of the orbit, they can be deflected backward, dragging the hotspot in the opposite direction. This is the leading hypothesis that researchers have settled on to explain CoRoT-2 b's backwards atmosphere — and it is unlike anything observed on another planet in or out of our solar system. A Window Into Planetary Diversity The significance of CoRoT-2 b goes beyond one anomalous planet. Hot Jupiters were once considered among the best-understood class of exoplanets precisely because their extreme properties made them easy to observe and their behaviour seemed predictable. CoRoT-2 b suggests that even within this well-studied category, the range of possible atmospheric behaviours is wider than models have accounted for. If slow rotation can produce a backwards hotspot on one hot Jupiter, there may be other worlds with similarly unusual rotation states that have been misinterpreted or overlooked in existing data. The researchers behind this work have described the pleasure of studying planetary exceptions — finding worlds that do not fit the standard picture and working out why. CoRoT-2 b, it turns out, is one of the most instructive exceptions yet found. What Comes Next Follow-up observations of CoRoT-2 b are expected to further probe the planet's atmospheric structure and test the slow-rotation hypothesis against competing explanations. The Very Large Telescope's spectroscopic capabilities allow researchers to map temperature distributions across the planet's visible disc, building a more detailed picture of where heat is concentrated and how it moves. Whether the slow rotation explanation holds up or gives way to something more surprising, CoRoT-2 b has already done what the best scientific anomalies do: it has forced astronomers to look at a class of well-studied objects and ask whether they fully understand them. The answer, at least for now, appears to be no.

CoRoT-2 b is a hot Jupiter exoplanet 696 light-years away that is breaking every rule astronomers have about how these scorching worlds work. On every other known hot Jupiter, the hottest point on the planet is shifted in the direction of its orbit. On CoRoT-2 b, it is shifted the other way entirely — and new data from the Very Large Telescope suggests the reason may be something nobody expected: the planet is rotating far too slowly.

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