<p>Our current Earth-Moon system was formed when a protoplanet named Theia smashed into our planet some 4.5 billion years ago. This is when Earth was just 100 million years old. The collision ejected loads of debris, some of which came back to Earth while the rest created our lunar satellite. Scientists have been studying this phenomenon and its consequences for years. They have even discovered possible remnants of Theia within the Earth’s mantle. The Moon, some scientists believe, was formed only in a matter of few hours.</p>

<p>Now a new study by scientists at the University of Nevada suggests that the aftermath of the collision likely led to the creation of not one but many moons. These results are available on the non-peer-reviewed preprint server arXiv. According to the study, these were a variety of polar moons—also known as circumbinary particles—that lingered around only for a short period of time. As per the scientists, the existence of these “moons” was possible only because of the close proximity of the Moon to Earth. Notably, at &nbsp;238,900 miles on average, the Moon in its first few hours of coming to life sat only five per cent as far from Earth as its present distance.&nbsp;</p>

<p>Also Read:&nbsp;<a href="https://www.wionews.com/science/nasa-to-set-up-lighthouse-on-moon-heres-how-it-will-help-astronauts-and-robots-747742">NASA to set up lighthouse on Moon. Here's how it will help astronauts and robots</a></p>

<p>“Circumbinary orbits that are polar or highly inclined to the Earth-Moon orbit are subject to two competing effects: nodal precession about the Earth-Moon eccentricity vector and Kozai-Lidov oscillations of eccentricity and inclination driven by the Sun,” the paper reads.&nbsp;</p>

<p>“While we find that there are no stable polar orbits around the Earth-Moon orbit with the current day semi-major axis, polar orbits were stable immediately after the formation of the Moon, at the time when there was a lot of debris around the system.”</p>

<p><strong>WATCH:&nbsp;Moon Drifting Away From Earth Approximately 3.8 Centimetres Per Year - Study</strong></p>

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<p>&nbsp;</p>

<h2>Earth moved away from us</h2>

<p>Nodal precession means that a body’s orbital parameters undergo a slow change around the angular moment vector. Kozai-Lidov oscillations involve a binary system and the perturbations introduced by a distant third body. Taking these factors into consideration, they deduced that the particles orbiting in the polar region were the most stable. This is directly linked to the earliest distance of the Moon from Earth. The Moon later started moving away from us because of the tidal forces.</p>

<p>“If a significant mass of material ended up on polar or librating orbits, then the eccentricity of the Earth-Moon binary could have been increased as a result of its interaction.”</p>

<p>The latest theory can help scientists learn more about the exoplanets outside our solar system.&nbsp;</p>


Our current Earth-Moon system was formed when a protoplanet named Theia smashed into our planet some 4.5 billion years ago. This is when Earth was just 100 million years old.

Our current Earth-Moon system was formed when a protoplanet named Theia smashed into our planet some 4.5 billion years ago. This is when Earth was just 100 million years old. The collision ejected loads of debris, some of which came back to Earth while the rest created our lunar satellite. Scientists have been studying this phenomenon and its consequences for years. They have even discovered possible remnants of Theia within the Earth’s mantle. The Moon, some scientists believe, was formed only in a matter of few hours. Now a new study by scientists at the University of Nevada suggests that the aftermath of the collision likely led to the creation of not one but many moons. These results are available on the non-peer-reviewed preprint server arXiv. According to the study, these were a variety of polar moons—also known as circumbinary particles—that lingered around only for a short period of time. As per the scientists, the existence of these “moons” was possible only because of the close proximity of the Moon to Earth. Notably, at 238,900 miles on average, the Moon in its first few hours of coming to life sat only five per cent as far from Earth as its present distance. Also Read: NASA to set up lighthouse on Moon. Here's how it will help astronauts and robots “Circumbinary orbits that are polar or highly inclined to the Earth-Moon orbit are subject to two competing effects: nodal precession about the Earth-Moon eccentricity vector and Kozai-Lidov oscillations of eccentricity and inclination driven by the Sun,” the paper reads. “While we find that there are no stable polar orbits around the Earth-Moon orbit with the current day semi-major axis, polar orbits were stable immediately after the formation of the Moon, at the time when there was a lot of debris around the system.” WATCH: Moon Drifting Away From Earth Approximately 3.8 Centimetres Per Year - Study × Earth moved away from us Nodal precession means that a body’s orbital parameters undergo a slow change around the angular moment vector. Kozai-Lidov oscillations involve a binary system and the perturbations introduced by a distant third body. Taking these factors into consideration, they deduced that the particles orbiting in the polar region were the most stable. This is directly linked to the earliest distance of the Moon from Earth. The Moon later started moving away from us because of the tidal forces. “If a significant mass of material ended up on polar or librating orbits, then the eccentricity of the Earth-Moon binary could have been increased as a result of its interaction.” The latest theory can help scientists learn more about the exoplanets outside our solar system.

Earth had several tiny hidden moons billions of years ago, study suggests

<p>What will happen to our solar system if it ever encounters a rogue star? Researchers, including lead author Sean N. Raymond and co-authors Nathan A. Kaib, Franck Selsis, and Herve Bouy, recently published a study on arxiv.org, concluding that a rouge star can irreparably disrupt our solar system, completely dislodging the Earth from its orbit.</p>

<h2><strong>What is a rogue star?</strong></h2>

<p>A star, which is no longer under the gravitational influence of its sun, can eject from its home galaxy and interact with neighbouring ones.&nbsp;</p>

<p>Such stars are called rogue elements, which can sometimes move in odd directions and interfere with the gravitational orbits of other stars.</p>

<p>Scientists used computer models to understand the impact of such a rogue star on our solar system if it ever pays a visit.&nbsp;</p>

<h2><strong>Results and predictions</strong></h2>

<p>The team relied on N-body simulations to help them determine “the possible evolutionary pathways of the planets under the perturbation from a close stellar passage,” which revealed a close to 92 per cent chance that the eight known planets in our solar system would remain in their current orbits or similar ones if a rogue star were to pass within 100 astronomical units (au) of the Sun.</p>

<p><strong>Watch:&nbsp;Chandrayaan-3: What are ISRO's plans to bring Moon samples to Earth?</strong></p>

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<p>Of all, mercury is the most fragile planet in our solar system, the scientists said.</p>

<p>“Mercury is the most fragile, with a destruction rate (usually via collision with the Sun) higher than that of the four giant planets combined,” the authors write in their paper.</p>

<h2><strong>What will happen to our Earth?</strong></h2>

<p>Speaking of the Earth, our planet may most likely collide with the moon in such a situation, thus completely eliminating life here.&nbsp;</p>

<p>It is also possible that our planet may get swayed by the gravitational pull of the rogue star, thus taking a radically different orbit altogether with the rogue star effectively acting as our new sun.&nbsp;</p>

<p><a href="https://www.wionews.com/science/europes-juice-probe-set-to-use-first-ever-double-gravity-assist-from-earth-and-moon-for-launch-to-jupiter-661150"><strong>Also read:&nbsp;Europe’s JUICE probe set to use first-ever ‘double gravity assist’ from Earth and Moon for launch to Jupiter</strong></a></p>

<p>Moreover, the Earth could end up in a more distant orbit than its current one, which would result in conditions becoming far colder due to the planet’s further distance from the Sun.</p>

<p>However, researchers said the chances of a rogue star disrupting our solar system are fairly low.&nbsp;</p>

<p><em>(With inputs from agencies)</em></p>


What will happen to our solar system if it ever encounters a rogue star? Researchers, including lead author Sean N. Raymond and co-authors Nathan A. Kaib, Franck Selsis, and Herve Bouy, recently published a study on arxiv.

What will happen to our solar system if it ever encounters a rogue star? Researchers, including lead author Sean N. Raymond and co-authors Nathan A. Kaib, Franck Selsis, and Herve Bouy, recently published a study on arxiv.org, concluding that a rouge star can irreparably disrupt our solar system, completely dislodging the Earth from its orbit. What is a rogue star? A star, which is no longer under the gravitational influence of its sun, can eject from its home galaxy and interact with neighbouring ones. Such stars are called rogue elements, which can sometimes move in odd directions and interfere with the gravitational orbits of other stars. Scientists used computer models to understand the impact of such a rogue star on our solar system if it ever pays a visit. Results and predictions The team relied on N-body simulations to help them determine “the possible evolutionary pathways of the planets under the perturbation from a close stellar passage,” which revealed a close to 92 per cent chance that the eight known planets in our solar system would remain in their current orbits or similar ones if a rogue star were to pass within 100 astronomical units (au) of the Sun. Watch: Chandrayaan-3: What are ISRO's plans to bring Moon samples to Earth? × Of all, mercury is the most fragile planet in our solar system, the scientists said. “Mercury is the most fragile, with a destruction rate (usually via collision with the Sun) higher than that of the four giant planets combined,” the authors write in their paper. What will happen to our Earth? Speaking of the Earth, our planet may most likely collide with the moon in such a situation, thus completely eliminating life here. It is also possible that our planet may get swayed by the gravitational pull of the rogue star, thus taking a radically different orbit altogether with the rogue star effectively acting as our new sun. Also read: Europe’s JUICE probe set to use first-ever ‘double gravity assist’ from Earth and Moon for launch to Jupiter Moreover, the Earth could end up in a more distant orbit than its current one, which would result in conditions becoming far colder due to the planet’s further distance from the Sun. However, researchers said the chances of a rogue star disrupting our solar system are fairly low. (With inputs from agencies)

A rogue star can send Earth smashing into Moon, wiping out all life, study finds

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Earth had several tiny hidden moons billions of years ago, study suggests

A rogue star can send Earth smashing into Moon, wiping out all life, study finds