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I still give better than even chances that there is microbiotic life on Mars. The surface is incredibly hostile, and it's very likely that any life would be difficult to locate. I was a bit disappointed that Curiosity wasn't more equipped to search for signatures of life. Ultimately, it might come down to human exploration to really determine if life is there. It is a very interesting point that we might not have had another candidate for colonization in our solar system. People often frame Mars colonization in terms of the difficulties, however, it's almost dumb luck that we can even entertain the notion. We have the current technology to colonize Mars. Now we just need to wait for the costs to fall and the our will to do it to rise.