Know 7 countries where asteroids crashed, creating giant craters that mark Earth's history. From South Africa to Estonia, these sites reveal ancient cosmic impacts and their lasting effects on our planet.

7 countries where an asteroid has crashed and created a crater

A few years back, scientists noticed strange circles at the bottom of Lake Michigan. This was when they mapped the lakebed inside the Wisconsin Shipwreck Coast National Marine Sanctuary in 2022.&nbsp;

Now, two years later, they finally have an explanation for these circles. Researchers say that these circles are nothing but giant holes.&nbsp;

Russ Green, a maritime archaeologist and superintendent of the sanctuary who took part in the expedition, told Live Science that they saw circles on the map that looked like natural occurrences. They appeared to be depressions in the seabed, but there was no confirmation.

Brendon Baillod, a local shipwreck hunter, also spotted the circles and was almost sure that they were craters, measuring between 20 and 40 feet (6 to 12 m) deep. He told Live Science, "There were dozens of them in our search grid."

They reached out to scientists at the National Oceanic and Atmospheric Administration's (NOAA) Great Lakes Environmental Research Laboratory (GLERL) who examined the circles in a joint mission.

Also Read:&nbsp;<a href="https://www.wionews.com/science/30-million-year-old-tree-fossils-found-in-a-place-that-is-practically-barren-762747">30-million-year-old ancient forest found in a place that is practically barren</a>

A remotely operated vehicle was sent into the sea to study the circles, and it was confirmed that they are enormous, naturally occurring craters. Scientists say they saw around 40 of them, but there might be more of them, Steve Ruberg, a researcher at GLERL, told the Milwaukee Journal Sentinel.

Earlier, similar depressions have been found at the bottom of Lake Huron bordering Michigan and Canada. These circles turned out to be sinkholes. These occur when the surface layer collapses because of groundwater dissolving the bedrock from below.

Ruberg believes that the craters in Lake Michigan might also be sinkholes since it&nbsp;sits partly on limestone, which is prone to dissolution.&nbsp;

However, not everyone is of the view that the craters are sinkholes. "I think they might be more accurately called craters, which have formed in the deep bottom sediment due either to water upwelling from below or trapped hydrocarbon off-gassing," Baillod said.

As of now, no water has been found escaping from the holes. This means there is groundwater circulating beneath the lakebed. Ruberg still expects researchers will eventually detect some. &nbsp;

Green said more research will be conducted to determine what the craters really are and the impact they might be having on Lake Michigan.&nbsp;

A few years back, scientists noticed strange circles at the bottom of Lake Michigan. This was when they mapped the lakebed inside the Wisconsin Shipwreck Coast National Marine Sanctuary in 2022.

A few years back, scientists noticed strange circles at the bottom of Lake Michigan. This was when they mapped the lakebed inside the Wisconsin Shipwreck Coast National Marine Sanctuary in 2022. Now, two years later, they finally have an explanation for these circles. Researchers say that these circles are nothing but giant holes. Russ Green, a maritime archaeologist and superintendent of the sanctuary who took part in the expedition, told Live Science that they saw circles on the map that looked like natural occurrences. They appeared to be depressions in the seabed, but there was no confirmation. Brendon Baillod, a local shipwreck hunter, also spotted the circles and was almost sure that they were craters, measuring between 20 and 40 feet (6 to 12 m) deep. He told Live Science, "There were dozens of them in our search grid." They reached out to scientists at the National Oceanic and Atmospheric Administration's (NOAA) Great Lakes Environmental Research Laboratory (GLERL) who examined the circles in a joint mission. Also Read: 30-million-year-old ancient forest found in a place that is practically barren A remotely operated vehicle was sent into the sea to study the circles, and it was confirmed that they are enormous, naturally occurring craters. Scientists say they saw around 40 of them, but there might be more of them, Steve Ruberg, a researcher at GLERL, told the Milwaukee Journal Sentinel. Earlier, similar depressions have been found at the bottom of Lake Huron bordering Michigan and Canada. These circles turned out to be sinkholes. These occur when the surface layer collapses because of groundwater dissolving the bedrock from below. Ruberg believes that the craters in Lake Michigan might also be sinkholes since it sits partly on limestone, which is prone to dissolution. However, not everyone is of the view that the craters are sinkholes. "I think they might be more accurately called craters, which have formed in the deep bottom sediment due either to water upwelling from below or trapped hydrocarbon off-gassing," Baillod said. As of now, no water has been found escaping from the holes. This means there is groundwater circulating beneath the lakebed. Ruberg still expects researchers will eventually detect some. Green said more research will be conducted to determine what the craters really are and the impact they might be having on Lake Michigan.

Dozens of massive craters discovered in Lake Michigan. No, asteroids didn't make them

A team of scientists, headed by ETH Zurich and Imperial College London, has found a never-known global meteorite impact on Mars with the help of seismic data.&nbsp;

According to their new findings, nearly 280 to 360 meteorites have been hitting the planet every year and creating craters greater than 8 metres (about 26 feet) across.

Study's co-lead Geraldine Zenhaeusern said, "This rate was about five times higher than the number estimated from orbital imagery alone. Aligned with orbital imagery, our findings demonstrate that seismology is an excellent tool for measuring impact rates."

This new analysis of the data collected by a seismometer on&nbsp;Mars&nbsp;has emphasised that space rocks have been hitting Mars more frequently than ever thought.

Based on the number of nearby impact-related tremors found by the Mars InSight lander, the scientists estimated that the planet must be facing smashing by rocks which are the size of a basketball almost every day.

Also Read:&nbsp;<a href="https://www.wionews.com/science/study-suggests-quakes-on-mars-hiding-water-secrets-of-red-planet-hints-at-possibility-of-life-735586">Study suggests quakes on Mars hiding water secrets of red planet, hint at possibility of life</a>

Co-lead author Geraldine Zenhausern&nbsp;of ETH Zurich and planetary scientist in Switzerland Geraldine Zenhausern&nbsp;said, "This rate was about five times higher than the number estimated from orbital imagery alone."&nbsp;

"Aligned with orbital imagery, our findings demonstrate that seismology is an excellent tool for measuring impact rates," he added.

<h2>Here's what craters tell about Mars' asteroid thrashing session</h2>

The speed at which a crater is formed on a planetary surface helps in understanding how old has the surface been.

Surfaces which have more craters are believed to be older in comparison to those with fewer craters. "By using seismic data to better understand how often meteorites hit Mars and how these impacts change its surface, we can start piecing together a timeline of the red planet's geological history and evolution,"&nbsp;said planetary scientist and co-lead author Natalia Wojcicka&nbsp;of Imperial College London.

"You could think of it as a sort of 'cosmic clock' to help us date Martian surfaces, and maybe, further down the line, other planets in the Solar System," she added.

Watch:&nbsp;Earth's days may be getting little longer: Unveiling the planet's mysteries

<div class="videoWrapper trancodeVideo"><iframe allowfullscreen="" autoplay="1" class="includeVideo" frameborder="0" height="350" src="https://www.wionews.com/videos/earths-days-may-be-getting-little-longer-unveiling-the-planets-mysteries-731789/embed" style="width:100%;max-width:560px;" width="560"></iframe></div>

Meanwhile, Mars is located close to the&nbsp;asteroid&nbsp;belt which lies between its orbit and the orbit of&nbsp;Jupiter and hence, has a lot of rocks in the vicinity which may have led to a high impact rate.

"While new craters can best be seen on flat and dusty terrain where they really stand out, this type of terrain covers less than half of the surface of Mars,"&nbsp;said Zenhausern. "The sensitive InSight seismometer, however, could hear every single impact within the landers' range," he added.&nbsp;

(With inputs from agencies)

A team of scientists, headed by ETH Zurich and Imperial College London, has found a never-known global meteorite impact on Mars with the help of seismic data. According to their new findings, nearly 280 to 360 meteorites have been hitting the planet every year and creating craters greater than 8 metres (about 26 feet) across.

A team of scientists, headed by ETH Zurich and Imperial College London, has found a never-known global meteorite impact on Mars with the help of seismic data. According to their new findings, nearly 280 to 360 meteorites have been hitting the planet every year and creating craters greater than 8 metres (about 26 feet) across. Study's co-lead Geraldine Zenhaeusern said, "This rate was about five times higher than the number estimated from orbital imagery alone. Aligned with orbital imagery, our findings demonstrate that seismology is an excellent tool for measuring impact rates." This new analysis of the data collected by a seismometer on Mars has emphasised that space rocks have been hitting Mars more frequently than ever thought. Based on the number of nearby impact-related tremors found by the Mars InSight lander, the scientists estimated that the planet must be facing smashing by rocks which are the size of a basketball almost every day. Also Read: Study suggests quakes on Mars hiding water secrets of red planet, hint at possibility of life Co-lead author Geraldine Zenhausern of ETH Zurich and planetary scientist in Switzerland Geraldine Zenhausern said, "This rate was about five times higher than the number estimated from orbital imagery alone." "Aligned with orbital imagery, our findings demonstrate that seismology is an excellent tool for measuring impact rates," he added. Here's what craters tell about Mars' asteroid thrashing session The speed at which a crater is formed on a planetary surface helps in understanding how old has the surface been. Surfaces which have more craters are believed to be older in comparison to those with fewer craters. "By using seismic data to better understand how often meteorites hit Mars and how these impacts change its surface, we can start piecing together a timeline of the red planet's geological history and evolution," said planetary scientist and co-lead author Natalia Wojcicka of Imperial College London. "You could think of it as a sort of 'cosmic clock' to help us date Martian surfaces, and maybe, further down the line, other planets in the Solar System," she added. Watch: Earth's days may be getting little longer: Unveiling the planet's mysteries Meanwhile, Mars is located close to the asteroid belt which lies between its orbit and the orbit of Jupiter and hence, has a lot of rocks in the vicinity which may have led to a high impact rate. "While new craters can best be seen on flat and dusty terrain where they really stand out, this type of terrain covers less than half of the surface of Mars," said Zenhausern. "The sensitive InSight seismometer, however, could hear every single impact within the landers' range," he added. (With inputs from agencies)

Asteroids thrashing Mars more than ever thought, leaving craters on Red Planet

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