Exo-moon

The first moon in orbit around a planet orbiting another star than the Sun may have been discovered.

There are many planets by other stars already accounted for. These are called exo-planets, exo meaning it is a planet outside of the Solar system. Consequently, a moon orbiting an exo-planet is called an exo-moon.

This is an interesting discovery, but not surprising. The more exo-planets we have found, the higher probability there would be also to find an exo-moon. In this case, it seems to be a moon the size of Neptune, orbiting a planet much more massive than Jupiter. The size of this moon is probably part of the cause it was discovered, if indeed it is. More observations are needed in order to confirm the discovery. I hope the exo-moon turns out to be there.