our crowded galaxy

by twit


via the BBC on February 15, 2009:

There could be one hundred billion Earth-like planets in our galaxy, a US conference has heard.  Dr Alan Boss of the Carnegie Institution of Science said many of these worlds could be inhabited by simple lifeforms.

… based on the limited numbers of planets found so far, Dr Boss has estimated that each Sun-like star has on average one “Earth-like” planet. This simple calculation means there would be huge numbers capable of supporting life.

… Recent work at Edinburgh University tried to quantify how many intelligent civilisations might be out there. The research suggested there could be thousands of them.

actually, tens of thousands:

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