Scientists have announced that they have spotted the first direct evidence of an exo-mooon, or a moon orbiting a planet outside our own Solar System. The chance came from a chance happening of gravitational lensing, an effect of relativity, which makes things very far away appear to be much closer than they are, like looking through a lens. The lensing won’t happen again, so it will be impossible to confirm this new discovery, only the one data set exists, although scientist think that this type of event isn’t too uncommon so we will be able to observe events just like it. This certainly points to the fact that exo-moons exist, which is exciting but also should be obvious. We constantly like to think of our Solar System as being special, but the more we learn about the heavens the more this hubris betrays us. It wasn’t all that long ago that people actually thought that exoplanets would be incredibly rare if they existed at all, but this has recently been show to be quite ridiculous. There are planets rotating around trillions and trillons of stars and through our humble efforts so far we have managed to spot thousands, all in the span of 20 years. Our Solar System has hundreds of moons, so why should other Solar Systems be any different. Discoveries like this are the beginning of the end of the special-Solar System worldview, and it is quite entertaining to see it be torn apart, because it allows for so much diversity to exist throughout the universe. 

http://www.sciencedaily.com/releases/2014/04/140412094104.htm