If I was able to award and Olympic gold medal, I would award it to Nasa for successfully landing the Curiosity probe on Mars. We still have no hard evidence that life has started anywhere else in the Universe other than on Earth.
I believe that life must have started on other planets somewhere in our galaxy but the chance of that life evolving into "intelligent beings" is probably remote. Believing something to be true is different to knowing that something is true and I would love to see hard evidence. Curiosity cannot, however, prove that life has never existed on Mars. Proof positive would lead to some profound changes to how we see ourselves and our place in the Universe. I will still not expect to meet some visitors from an alien planet even if we prove that there is life elsewhere in our solar system.
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