Nobody knows. Probably a lot. We don't even know how many there are in the solar system, let alone the rest of the universe.
0 is the answer
5
none
1is the answer
Venus has no natural satellites.
There r many satellites in space. there are 7
yes
by satillites.
Saturn has 82 known moons, with the largest being Titan.
This is interesting. Now they may have found us the way we are looking for them. We are looking for waves. Anything tecnilogical will release waves. under a certain kind of lense, these things appear bright. Now if aliens used this, they would be able to see earth. Or, maybe they send out satillites like we do. A theory is that some UFO's seen in space are satillites from extraterrestrials.
No it cannot.
Saturn