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- Mon Jul 31, 2006 2:42 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Valles Marineris(Grand canyon of MARS) (APOD 30 Jul 2006)
- Replies: 4
- Views: 2361
Re: Valles Marineris(Grand canyon of MARS)
I think gerald-nz has got it right. Valles Marineris has a lot of features that are hard to explain geologically, but are consistent with a grazing collision with another body. Consider: the valley is nearly straight, tapering at the ends and deepest in the middle; the center area looks as though an...