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2 questions
14
votes
3
answers
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Rock arches on the moon?
The large rock in the centre right position (cut off by the image's right edge) of this photo seems to include the left part of a (small) natural arch:
Is this indeed a rock arch? Are complete ...
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4
votes
1
answer
950
views
Which scientific articles together give proof of all the chemical elements found on Mars?
Wikipedia about the elemental composition of Mars:
Based on these data sources, scientists think that the most abundant chemical elements in the Martian crust, besides silicon and oxygen, are iron, ...
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