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Astronauts who returned recently from a Space Shuttle mission said on Monday that they expected alien life would be discovered.
"Life like us must exist elsewhere in the universe," Takao Doi, who had been on a 16-day Endeavour mission to the International Space Station, told reporters in Tokyo.
In December, Nobutaka Machimura, Japan's chief Cabinet secretary, said that UFOs definitely existed and that he was firmly of the opinion that aliens were out there.
Originally posted by johnsky
If you take the probability of a planet being in the right condition to sustain life, and the probability of life starting on that planet... then compare that probability to the sheer massive size of the universe...
Astronomer Ian Crawford recently wrote about this in Scientific American. His diffusion model leads to "full galactic colonization" in 5 to 50 million years (Sci. Am., Nov. 2000, p. 8), a small fraction of the age of the Galaxy. Naturally this all assumes human-like behaviour and motivation. The bottom line is that if even only a few alien civilizations have arisen in the 10 billion or so year history of our Galaxy, most of the habitable parts of the Galaxy would likely be colonized by now.