"How may years would a radio signal take to reach the nearest large galaxy to us, the Andromeda Galaxy? "
Content with the tag: “habitability”
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Astrobiology: The Study of the Living Universe
Christopher Chyba and Kevin Hand of the NAI’s SETI Institute Lead Team have just published this article in the Annual Reviews of Astronomy and Astrophysics (ARAA). It reviews the habitability of the Galaxy in general and of planets and moons in particular, and summarizes current controversies in origins-of-life research and in evidence for the earliest life on Earth. It critiques certain “rare Earth” and “anthropic” arguments, and considers four approaches to deciding whether intelligent life exists elsewhere...
September 26, 2005 / Posted by: Shige Abe
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