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Originally Posted by 70Chip
Shouldn't we assume that the proximity of Mars (and Venus for that matter) mean that it would be made of similar stuff to Earth? Wouldn't it be more surprising if it it were composed of completely different elements?
I mean we know Jupiter is in a different class. It doesn't really even have a solid surface, but the inner planets are all basically siblings, cosmologically speaking.
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Just to add to that, it actually shouldn't be surprising that planets from a different galaxy have the same sort of elements since all matter in the universe originated from the same point -- Big Bang Theory.
That certainly isn't to say that there isn't stuff we haven't seen though.