Astronomers have discovered the fastest rotating object for its size in the Solar System. The Kuiper Belt Object 2003 EL61, discovered in July, rotates once every 3.9 hours. Rather than being spherical like Pluto, the object has a shape much like a squashed rugby ball, its discoverers say. Details of the work were presented at a scientific meeting in Cambridge, UK. “It’s by far the record,” said David Rabinowitz, of the department of astronomy at Yale University, US.