19. How old is the Moon? (A K2S Question)
From The Space Library
The Moon is about as old as the rest of the solar system— 4,560,000,000 years, based on radioactive decay dating of lunar rocks. http://www.pbs.org/wgbh/nova/tothemoon/origins2.html (See CDROM)
Answer provided by Thomas Matula, Ph.D. & Kenneth J. Murphy
Question and Answer extracted from the book Kids to Space - by Lonnie Schorer
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