21st Feb 2013

imagehalover9k replied to your post: jonic replied to your link: Want to name the moons…

Can a moon have moons?

In theory, yes. There’s a huge hierarchy of celestial bodies orbiting bigger celestial bodies—for example, the moon orbits the Earth which orbits the sun which orbits around the centre of the galaxy, which is likely orbiting around a local group of galaxies, etc…

But basically, with each smaller step, the system becomes more unstable, because the larger body destabalises the orbit and will eventually capture the smaller satellite. It’d be difficult to knock the Milky Way out of orbit, but surprisingly easy to knock Earth out of orbit (say, if another star passed too close to our solar system, its gravitational pull could rip us away). 

So theoretically, moons can have moons that have moons that have moons, but their orbits would decay and so wouldn’t last long.

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  1. bury-yourhead reblogged this from bury-yourhead and added:
    Looking at this again, I question this. Do moons have enough gravity to keep anything in orbit? Or could satellites even...
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    Answers to your questions
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  12. geeksaurusrex said: Yo, dawg, I heard you liked moons, so I put a moon with your moon with your moon…
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