Stop Press! - Jupiter Impact Event
20th July 2009
Congratulations to Australian amateur Anthony Wesley for the discovery of the impact 'scar' seen here in the South Polar Region (SPR) of the planet Jupiter. This Earth-sized scar is likely to have been caused by a cometary body impacting with the giant gas planet. Further information in the links below:

National Geographic News (with my image!)
British Astronomical Association

My animation here

In the image below, the black, elongated scar is seen near the top. The dark spot near the center is the shadow of the moon Io which can be seen to the right of the shadow.