Do any moons have moons?
- SpeedLv 74 weeks agoFavorite Answer
So far, none has been discovered. See https://earthsky.org/space/can-moons-have-their-ow... for details.
- Ronald 7Lv 74 weeks ago
None that we have Noticed
- CliveLv 74 weeks ago
Not that anyone knows of. Certainly there are none in our solar system. But it's entirely possible they could exist around other stars.
- LônLv 74 weeks ago
No, they don't.
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- Anonymous4 weeks ago
Pluto is a dwarf planet smaller than our moon. It has a moon called charon, of nearly equal size.
- RaymondLv 74 weeks ago
In the modern sense of a moon (small m) being a natural satellite, there are no signs of this within our Solar system.
Back in the 1960s and 1970s, people used the word "moon" for any object - natural or artificial - in orbit around a planet.
Sputnik, Echo, the Mercury capsules, etc. were popularly called "moons" even though they were not natural objects. If you accept this definition, then humans have placed "moons" around our Moon (Earth's natural satellite) and around Titan (a satellite of Saturn).
Orbits around a satellite are unstable over long periods. This is why any probe placed in orbit around our Moon must also come with a plan to get rid of it once its job is done (usually by crashing it onto the Moon), to make sure it will not go into an unstable orbit and become a danger to future missions.
So, it does not look promising. A natural object having a stable orbit (over millions of years) around a planet's satellite would be very improbable.
But not impossible.