Asteroids have hit the earth many times, causing major extinctions and leaving tell-tale craters?and it turns out there are gigantic craters on Mars as well. Perhaps they wiped out life there as well?
A huge gash that has been discovered on Mars has long proven is the largest known crater in our solar system?so big, that it reshaped the planet by blasting away much of the planet?s crust in the area where it hit over 4 billion years ago.
In New Scientist, David Shiga reports that this conclusion goes along with "other evidence that numerous large projectiles were careening through the inner solar system at this time, such as the Mars-sized planet that walloped the primordial Earth and formed our Moon, yet left no trace on Earth."
Art credit: NASA
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