Ridges or Craters?
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by CMcColl
The black thing at the left-hand side, do you think it's a crater? I thought it was
Posted
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by AUricle
Try reading this http://planetfour.org/#/about and this http://blog.planetfour.org/2013/01/09/more-on-planet-four/.
It'll give you good general idea of what is happening and what you're seeing (and what to do with what you find) .....then feel free to ask any questions or make comments.
That said, you'll find out that the "black thing" is dust on top of a layer of frozen carbon dioxide (dry ice)
Hope this helps!Posted