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Old 17-08-2016, 05:09 AM   #101
tommorgan
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Quote:
Originally Posted by amanhasnoname View Post
I have not yet formed an opinion on this. But I'm curious so just looked up some stats. NASA's own stats from the site below says that the moon has a volume which is 0.02 that of Earth, but a mass that is 0.01 that of earth.

http://nssdc.gsfc.nasa.gov/planetary.../moonfact.html

So unless it's made from very different material than earth, something doesn't quite look right at first glance.
If density is constant then mass is proportional to volume and therefore the cube of the radius because volume is 4/3*pi*r^3 for a sphere. (The relationship between mass and volume is not directly proportional.) In this comparison density is not constant, however. The moon is 3.35 g/cm^3 and the earth is 5.52 g/cm^3.
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