View Full Version : Moon-Related Question
2009-Apr-10, 06:34 PM
What is the minimum distance at which the Moon would lose all significant gravitational attraction from Earth (i.e. goes into its own orbit around the Sun)?
As always, I'm only curious.
2009-Apr-10, 06:38 PM
That would be the radius of the Hill Sphere (http://en.wikipedia.org/wiki/Hill_sphere), or about 1.5 million kilometers.
2009-Apr-10, 06:44 PM
The Hill Sphere (http://en.wikipedia.org/wiki/Hill_sphere) of the Earth has a radius of around 1.5 million km but I think the orbit of the Moon would start to become unstable at anything over 1 million km.
EDIT: Beaten to it again! I must learn to compose posts quicker, or to check that nobody else has posted in the meantime...
2009-Apr-10, 06:49 PM
Got it. Thanks, guys. :)
That's okay, speedfreek, you beat me by half a day. ;)
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