Apparently there's opals on mars. and no life. or at least not anymore (not on the surface)
anyway, mars used to be warmer and wetter. now its cold and dry. WTFmate? My theory is that the planets were not always at the distance from the sun that they are now. maybe they were a lot closer. Earth was once really hot and wet. Then we had an ice age. Then suddenly it got warmer again. (and warmer, and warmer...) (vote green!)
so our future will either be like mars- cold, dry no atmosphere.. or like venus- hot, molten crust, thick atmosphere.
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