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Old 4th January 2019, 07:33 PM   #41
RecoveringYuppy
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There is a worse effect than Earth's gravity on Lunar orbits. Some parts of the Moon's surface are a lot denser than others and the Moon's gravitational field isn't uniform.
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Old 5th January 2019, 07:13 AM   #42
grmcdorman
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Originally Posted by rjh01 View Post
I agree. I think most lunar orbits are unstable because the Earth's gravity will pull and push an orbiter out of its orbit so that it will either crash into the moon or fly away from the moon. Some of the Lagrangian points are stable. This is where the two ARTEMIS are.
It's not that, or at least not principally that. The Moon is "lumpy"; its gravitational field is irregular. See Mass_concentration_(astronomy)WP.

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Old 5th January 2019, 07:32 AM   #43
RecoveringYuppy
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Page boundaries will do that to you.
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Old 5th January 2019, 08:06 AM   #44
alfaniner
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I'm rather surprised I haven't seen any concern expressed by The PDJT -- who knows what they could be doing on the far side of the Moon? They could be building a Space Force of Extraordinary Magnitude!!!
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Old 5th January 2019, 08:39 AM   #45
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Originally Posted by alfaniner View Post
I'm rather surprised I haven't seen any concern expressed by The PDJT -- who knows what they could be doing on the far side of the Moon? They could be building a Space Force of Extraordinary Magnitude!!!
I think they're attacking Putin's secret moonbase full of space ninjas, giant lasers and women in bikinis.
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