NASA: Asteroids fractured moon's crust
Source: Agencies |
December 7, 2012, Friday
|
Print Edition
Print Edition
ASTEROIDS and comets colliding with the moon pitted its surface and severely fractured its crust, researchers with NASA said on Wednesday, in a finding that could help crack a Martian puzzle.
On Mars, similar fracturing would have given water on the surface a way to penetrate deep in the ground, where it may remain today, they said.
"Mars might have had an ancient ocean and we're all wondering where it went. Well, that ocean could well be underground," planetary scientist Maria Zuber, with the Massachusetts Institute of Technology, said at the American Geophysical Union conference in San Francisco.
The discovery that the moon's crust is deeply fractured came from a pair of small probes that comprise NASA's Gravity Recovery and Interior Laboratory, or GRAIL, mission. The spacecraft have followed each other around the moon for nearly a year.
Scientists have been monitoring the distance between the two, which changes as they fly over denser regions of the moon.
The gravitational pull of the additional lunar mass causes first the leading probe and then the other one to speed up, altering the gap between them.
The data, assembled into the first detailed gravity maps of the moon, reveal asteroids and comets fractured the crust, possibly all the way down to the mantle.
"If you look at the surface of the moon and how heavily cratered it is, all terrestrial planets look that way, including the Earth," said Zuber, the lead GRAIL scientist.
Evidence of the phenomenon on Earth was wiped out by tectonic plate movements, erosion and other natural events.
"If we want to study those early periods, we need to go someplace else to do it and the moon is the closest and the most accessible example," Zuber said.
- About Us
- |
- Terms of Use
- |
-
RSS - |
- Privacy Policy
- |
- Contact Us
- |
- Shanghai Call Center: 962288
- |
- Tip-off hotline: 52920043
- 娌狪CP璇侊細娌狪CP澶05050403鍙-1
- |
- 浜掕仈缃戞柊闂讳俊鎭湇鍔¤鍙瘉锛31120180004
- |
- 缃戠粶瑙嗗惉璁稿彲璇侊細0909346
- |
- 骞挎挱鐢佃鑺傜洰鍒朵綔璁稿彲璇侊細娌瓧绗354鍙
- |
- 澧炲肩數淇′笟鍔＄粡钀ヨ鍙瘉锛氭勃B2-20120012
Copyright 漏 1999- Shanghai Daily. All rights reserved.Preferably viewed with Internet Explorer 8 or newer browsers.
