TallyMan wrote:
I remember the excitement from many years ago when the (forgot the name of the lander now) did three experiments to determine if there was microbial life on Mars and all three gave positive results! However, for reasons unknown, this public announcement by NASA was turned on its head and they said they had made a mistake and the results were due to some unusual chemical reactions with the clay. Hmmmm. I've been wondering ever since what really happened there. I wouldn't be the least bit surprised if microbial life is found, considering there has been water there, and still is here and there.
Viking I. The results, actually, were two "probably not" and one "maybe", which was still astonishing (as was the fact that the soil sample that was scooped up turned out to be more like clay than sand). That's where a manned mission would have been useful; a scientist on the scene could have run additional tests, whereas the simple robot sent could only run those three tests, and even then only once each.
That's also one reason the Curiosity rover was landed in Gale Crater - there's a rather tall mountain in the middle, and orbital scans indicate that there may be chemicals at the base that, if they are there, would tend to indicate probably microbial life back when that area was under water - about a billion years ago.
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.