您现在的位置是:休閑 >>正文
【】
休閑696人已围观
简介Our solar system is a dynamic, evolving realm of space.A powerful camera aboard NASA's Mars Reconnai ...
Our solar system is a dynamic, evolving realm of space.
A powerful camera aboard NASA's Mars Reconnaissance Orbiter — a satellite orbiting the red planet — spotted a relatively recent impact site on the Martian surface. The spacecraft detected a dark spot on the ground, and then the high-resolution camera (called the High-Resolution Imaging Experiment) snapped the detailed shot.
The impact, which is brand new in cosmic terms, likely formed between February 2006 and March 2014, noted the imaging team at the University of Arizona. For a size reference, the entire black and white image is under five kilometers, or some 3 miles, across. Blasted-out rays of material are clearly visible around the crater, which formed from a falling asteroid or meteorite.
Tweet may have been deletedSEE ALSO:If a scary asteroid will actually strike Earth, here's how you'll know
Compelling Mars photo shows Martian water flowed way more recently than we think
Scientists detect something really unexpected beneath Saturn's 'Death Star' moon
The mega-comet hurtling through our solar system is 85, yes 85, miles wide
Mars is absolutely covered in craters. NASA estimates there are over a quarter-million impact craters about the size of Arizona's famous Barringer Crater, which is some 4,000 feet across. And there are over 43,000 Martian craters larger than three miles wide.

Meanwhile, Earth has just around 120 known impact craters. That's because over hundreds of millions of years, different parts of Earth's surface have both been covered in lava or recycled as the giant plates that compose Earth's crust (tectonic plates) continually move rock below and back up to the surface. Mars isn't nearly geologically dead — marsquakes frequently occur there — but it's not nearly as active as Earth, a water-blanketed planet teeming with erupting volcanoes. On Mars today, there's little to wash away, or cover up, new craters.
One of Mars' most recent impact craters, then, might be visible for millions and millions of years.
TopicsNASA
Tags:
转载:欢迎各位朋友分享到网络,但转载请说明文章出处“夫榮妻貴網”。http://new.maomao321.com/news/30c1499955.html
相关文章
Australian football makes history with first LGBT Pride Game
休閑The rainbow flag took over Melbourne's Etihad Stadium Saturday night in a powerful statement of acce ...
【休閑】
阅读更多還沒回來!保利尼奧曬家人遊玩照片 與妻子秀恩愛
休閑還沒回來!保利尼奧曬家人遊玩照片 與妻子秀恩愛_廣州www.ty42.com 日期:2021-03-09 11:31:00| 評論(已有260757條評論) ...
【休閑】
阅读更多多特四年來首次進八強 過去兩年均輸給歐冠亞軍
休閑多特四年來首次進八強 過去兩年均輸給歐冠亞軍_總比分www.ty42.com 日期:2021-03-10 08:01:00| 評論(已有260927條評論) ...
【休閑】
阅读更多