Does the water suggest Mars supported other life forms in the past — or does in the present?
We have no idea. There’s just no conclusive evidence. It’s like the question about intelligent life in the universe — we swing back and forth on a pendulum. Currently, we’re in one of the pessimistic periods, that there’s no life on Mars. It’s cold there and the atmosphere is thin. If there was life, there’d be fossils there — but we just don’t know. Where would you rank this among space discoveries? If on a scale of 1 to 10, landing on the moon is a 10, for example. If this holds up, I’d give it a 7. To my eye, it is very difficult to think of a viable explanation for this photo besides liquid water, but one wonders, perhaps, if there is some sort of landslide that could replicate the appearance of water. There certainly are odd landslide events that we know of — the singing sands, and so forth. I know a number of scientists believe it is water, and if true, it’s pretty important. In terms of short-term exploration, this finding doesn’t tell us there’s water on Mars. It just sugges
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