The comet was named Siding Spring
It came as if thrown from a sling
From the distant Oort cloud
Passing Mars as it ploughed
Round the Sun, then it left with a swing.
The Comet Siding Spring, which originated in the Oort Cloud, passed close to Mars on 19th October and while it was photographed from the Mars Opportunity Rover and Mars Renaissance Orbiter (above) we will probably have to wait for the most interesting findings until a conference to be held in December. In the mean time the best places to find the latest news is on Wikipedia under the comet's official name C/2013 A1.