Seth Shostak Quotes
The Moon stabilizes Earth's obliquity. Well, almost. The tilt actually varies between 22 and 24.5 degrees - and the variation is enough to induce such environmental inconveniences as the occasional ice age. Without the Moon, it might be much worse.
Citations
Shostak, Seth. Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence. National Geographic Books, 2009.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.