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<blockquote data-quote="tomBitonti" data-source="post: 6850957" data-attributes="member: 13107">Actually, I wonder what the probabilities would be for a structure on Mars to be a remnant of a past Earth based civilization vs. the probability that it was a Mars based civilization, vs the probability that it was from another star.The risk increases dramatically to the second and then again to the third case.I suspect folks would be extremely cautious re: The chance of contagion, however slight.&nbsp; I doubt any material would be sent back until it was very extensively studied on site.It would seem that the chance of advanced technology is high in all three cases: The third case is a given.&nbsp; The first requires space travel capabilities in advance of our own.&nbsp; For a remnant of a Martin civilization, the odds depend on the expected lifetime of a civilization (the odds are that the site is from the end of the civilization).&nbsp; That's very hard to estimate, but until we have additional data (we have one sample point currently), the upper end of the range to estimate seems quick high.Thx!TomB</blockquote>

[QUOTE="tomBitonti, post: 6850957, member: 13107"] Actually, I wonder what the probabilities would be for a structure on Mars to be a remnant of a past Earth based civilization vs. the probability that it was a Mars based civilization, vs the probability that it was from another star. The risk increases dramatically to the second and then again to the third case. I suspect folks would be extremely cautious re: The chance of contagion, however slight. I doubt any material would be sent back until it was very extensively studied on site. It would seem that the chance of advanced technology is high in all three cases: The third case is a given. The first requires space travel capabilities in advance of our own. For a remnant of a Martin civilization, the odds depend on the expected lifetime of a civilization (the odds are that the site is from the end of the civilization). That's very hard to estimate, but until we have additional data (we have one sample point currently), the upper end of the range to estimate seems quick high. Thx! TomB [/QUOTE]

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