One of Jupiter's bands disappeared.

In late 2009 Jupiter left the view of our telescopes as it made it's orbit around the sun. It recently came back into view and it seems it may have left something behind...

http://www.popsci.com/science/article/2010-05/while-hiding-behind-sun-jupiter-loses-one-its-belts

One of Jupiter's most prominent bands, a stream of gas in the atmosphere which circles the planet in a specific region, has disappeared while it was behind the sun.

Apparently it's done this before, twice since 1973, and scientists expect the band to return within weeks or months.