Scientists have discovered what could be a 22-mile impact crater buried deep beneath the ice sheets of Greenland.
If so, it would be the second discovery of the kind announced in recent months.
A NASA glaciologist spotted signs of the possible crater in northwestern Greenland just 114 miles from the newly discovered crater beneath the Hiawatha Glacier while crumbling satellite imagery and topographic maps of the area
Exactly how and when It has formed remains a mystery, although researchers suspect it may have been over 80,000 years old.
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A glaciologist from NASA identified the signs of the possible crater in northwestern Greenland just 114 miles from the crater recently discovered under the Hiawatha glacier (pictured) Scouring of satellite images and maps topographical survey of the area
The researcher analyzed NASA Earth and Aqua satellite images along with NASA's IceBridge operation and discovered what looked like a depression shaped like a bowl in the rock. It is estimated that the suspect crater is 22.7 miles wide (shown)
"We have examined the Earth in many different ways, from the earth, from the air and from space: it is exciting that such discoveries are still possible" , said Joe MacGregor, a glaciologist at NASA's Goddard Space Flight Center, who participated in the discovery of a crater previously announced in November 2018.
That crater, estimated at 19 miles wide, is located under the glacier Hiawatha and is now the first impact crater ever
Previously it was thought that most of the evidence of ancient impacts would have been erased by overlying ice over many years.
After the first discovery, however, the team began to suspect there may be others
"I began to wonder" Is it another impact crater? Do the underlying data support this idea? "" MacGregor said.
"Helping to identify a large impact crater under the ice was already very exciting, but now there seemed to be two."
The researcher analyzed images from the moderate-resolution Imaging Spectroradiometer tools on NASA's Terra and Aqua satellites along with those of the NASA IceBridge operation and discovered what looked like a bowl-shaped depression in the fresh rock.
The suspect crater is estimated to be 22.7 miles wide.
According to the team, it would be the 22nd largest impact crater known on Earth, if it really turns out to be one.
"The only other circular structure that could approach this size would be a collapsed volcanic caldera," MacGregor said.
"But the areas of known volcanic activity in Greenland are several hundred miles away, and a volcano should have a clear positive magnetic anomaly, and we do not see it at all."
Although the new crater Scientists have discovered what could be a 22-mile impact crater buried deep beneath the ice of Greenland ” class=”blkBorder img-share” />
Scientists have discovered what could be a 22-mile impact crater buried deep beneath the ice of Greenland
in the area it is at least 79,000 years old, the team says.
If this really is an impact crater, the researchers say that o happened more than 79,000 years ago, or, if it was more recent, all the ice of eroded weather.
& # 39; The layers of ice above this second crater are unequivocally older than those above Hiawatha and the second crater is about twice as eroded, "said MacGregor
" If the two were formed in the same moment, then probably the ice more often above the second crater would have balanced with the crater much faster than for Hiawatha. "
The team says it is possible that the two nearby craters were simply made up of completely separate impact events
WHAT HAS WAS THE CRATERO OF IMPACT OF HIAWATHA IN NOV 2018?
A 19-mile (30 km) impact crater left by the event remained hidden for at least 12,000 years under the Hiawatha Glacier in the remote northwest of Greenland
Scientists have recently identified what is said to be the first known impact crater underneath one of the Earth's ice caps.
The jig This meteoric crater five times larger than Paris was found half a mile (0.8 km) under the ice in Greenland.
It is one of the largest impact craters on Earth and suggests a width of 3,300 feet (1,000 meters) broken iron object on our planet during the last ice age.
It is believed that the resulting explosion has thrown debris over several hundred miles in each direction, reaching Canada today.
The 12-billion billion meteorite landed with the power of 47 million Hiroshima bombs, erasing all life within a 60-mile (100 km) radius, scientists said.
The crater measures 19 miles (31 km) across, covering an area five times larger than Paris . Scientists examined the size and shape of the crater to predict the impact that the meteorite could have had
A 19-mile-wide crater (30 km) left by the event has remained hidden for at least 12,000 years under the Hiawatha Glacier in remote Northwestern Greenland, although scientists have not dated the event in a categorical way.
Three million years could have passed as the Greenland ice cap had already begun to form.
The crater was identified with data collected between 1997 and 2014, supplemented with other harvests in 2016 using an advanced radar survey form.
This is consistent with the Earth's cratering records, they say.
"This does not rule out Possible that the two new craters of Greenland were made in a single event, like the impact of a well-separated binary asteroid, but we can not even agree with it," said William Bottke, one planetary scientist at the Southwest Research Institute in Boulder, Colorado.
"The existence of a third pair of unrelated craters is modestly surprising, but we do not consider it unlikely," MacGregor said.
"Overall, the evidence we have gathered indicates that this new structure is most likely an impact crater, but at present it seems unlikely to be a twin with Hiawatha."