Using the NASA/ESA Hubble Space Telescope, scientists have discovered that a giant extrasolar planet called 2MASSWJ 1207334-393254b has patchy clouds and rotates twice as fast as Earth. This is an illustration of the super-Jupiter 2M1207b and the brown dwarf 2M1207A. The planet completes one rotation every 10 hours – about the same rate as Jupiter. Because the planet is young, it is still contracting under gravity and radiating heat. The atmosphere...