"NASA's current Mars strategy is to look for signs of water and perhaps life in the planet's distant past. "Perhaps we need to also think in terms of present-day life holding on somewhere in the subsurface," said Lisa M. Pratt, a professor of geological sciences at Indiana University who participated in the news conference but was not involved with the research."
I think that any planet that has passed through, is passing through or is about to pass through the habitable zone, has had, does have, or will have life upon it. Therefore, the common knowledge by the end of the 21st Century may be that life is or has been very common in the universe.
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