We take a look at the answer to this intriguing question
Check out the final moments of the comet chaser – in pictures
The object was the size of a small boulder and may be part of a meteor swarm that also flew past Earth
A curious galaxy has been caught dancing the crazed dance of a galactic merger
Find out why manmade satellites don’t crash into each other all the time
Comet 2013 A1 (Siding Spring) is set for a close encounter with the Red Planet in late 2014.