Get the latest Science News and Discoveries
This Binary Asteroid is Messed Up. It's Probably Earth's Fault
Space is big, really big! Finding new asteroids which are usually dark against the inky blackness of space is harder than looking for a needle in a cosmic haystack. Back in 1991 an astronomer discovered a kilometre wide asteroid which was subsequently found to have a smaller moon half its size.
None
Or read this on Universe Today