Now our world has two 'natural' moons.
OK! - Luna is still number one; but now Earth
has another natural orbiting companion according to two
astronomers.
A 100 meter diameter asteroid named Asteroid
2010 s016. More info can be surfed about it via this link:
PhysOrg.com.
It appears that it orbits Earth in a strange 'horseshoe' orbit.
It doesn't appear to get closer to Earth than 2-3 million
klicks. Phew! They say its orbit is stable, but I don't know;
what if something nudges it? I'd be a little nervous.