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- Mon May 28, 2007 2:08 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: A Hole in Mars (APOD 28 May 2007)
- Replies: 109
- Views: 36958
They say the holes are collapsed lava tubes (couple of hundred meters wide and deep). I agree with this idea. They look fresh, no doubt the holes are quickly in-filled by wind blown dust. Some craters near the holes are not craters, they are in filled holes; they have odd looking rims. How many &quo...