Why in heaven sometimes appear two moon ?!

[Titan ;x]

Often at night, you can look it happens that two moon appear in the sky to us. This is a phenomenon that has been observed for the first time by astronomers, in September 2006 "> 2006.

At first they thought it was a missile booster burned, but it was not. The second moon which is orbiting the earth was a small asteroid.

The asteroid was captured by Earth's gravity and for 11 months between 2006 "> 2006 and 2007 appeared as the second moon, writes BBC.

The asteroid called 2006 "> 2006 RH120, spends most of the time turning and so he often appears as the second Monday.