Seth Shostak Quotes
If gravity were somewhat stronger or weaker, stars wouldn't exist, and neither would you. And the same can be said of other constants of physics. Several have to be 'just right.'
Citations
Shostak, Seth. Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence. National Geographic, 2009.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.