There are at least 5 known or theorized volcanic moons in our solar system. The Moon, Jupiter's moon Io, Saturn's moons Enceladus and Titan, and Neptune's moon Triton are all volcanic.
Mercury and Venus do not have moons.
169 moons.
There are 180 moons in our solar system.
There are six.
About 120 planets are in our solar system.
Mercury and venus
Two of them
At least 178
13
The answer is there are two planets which have no moons. Venus and Mercury
there are about 5.3 billion suns in our solar system, each containing about 4 moons
None. Ganymede is a moon of Jupiter. No moon in the solar system has moons of its own.