环亚观天下
联系我们

环亚观天下 您当前的位置:主页 > 环亚观天下 >   

滑坡发现在8217年代首次使用罗塞塔号彗星图像

发布日期:2018-09-28 作者:admin

A 100-meter cliff on Comet 67P was caught by the Rosetta’;s spacecraft’;s cameras as it dramatically collapsed。 It’;s the first time a landslide on a comet was documented。

ESA/Rosetta/NavCam

This image taken on July, 2015, shows a white outburst emanating from comet 67P。 The bright flash is radiating ice exposed by a cliff which collapsed。 Credit: ESA/Rosetta/NavCam

A while ago, Maurizio Pajola, an astronomer at the Nasa Ames Research Center, California, was up late at night casually browsing images taken by the famous Rosetta spacecraft when he came across something strange。 He saw a bright patch emanating out of the comet’;s dim surface in a photo taken by ESA’;s spacecraft in December, 2015。 So Pajola went through the catalog of images that focus on the region in question, a cliff called Aswan。 He eventually came across an image snapped in on July 10, 2015 were a large plume of dust was showing。 A snapshot taken just five days later clearly showed the cliff had collapsed, linking the bright outburst to the landslide。 In the wake of the landslide, a giant 70 metres-long by one metre-wide fracture was carved。

When the cliff collapsed, it exposed a patch of pristine ice which radiated strongly which explains the bright features at the top of Comet 67P that Pajola had initially witnessed。

A 70 metre-long, 1 metre-wide fracture was created in the wake of the cliff's collapse。 Take a moment to appreciate how sharp these images are -- taken by a spacecraft orbiting a freaking comet millions of miles away from Earth。 Credit: ESA。

A 70 metre-long, 1 metre-wide fracture was created in the wake of the cliff’;s collapse。 Take a moment to appreciate how sharp these images are —; taken by a spacecraft orbiting a freaking comet millions of miles away from Earth。 Credit: ESA。

Previously, scientists had thought such outbursts, seen before in other comets, were the result of pressurized gas that blasted through the comet’;s warm interior。 Now, astronomers need to rethink the mechanics of such events often observed in comets which come too close to the sun。

Copyright © 2005-2017 http://www.ammolitert.com 环亚娱乐_真人官网娱乐_环亚科技_网易新闻版权所有 环亚娱乐_真人官网娱乐_环亚科技_网易新闻