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- Mon Feb 04, 2008 3:15 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Mercury's Spider Crater (APOD 04 Feb 2008)
- Replies: 58
- Views: 21900
These two craters don't appear related. The older (and somewhat larger) appears to be the source of the rays. I suppose that the older one is volcanic in origin, or that a partially liquid obeject struck the surface, or the surface was somewhat liquid at the time of impact. The newer one seems to be...