NASA's Cassini spacecraft took this photograph of Saturn's chaotic, tumbling moon Hyperion. Only 266 km (165 miles) across, Hyperion one very large crater which scientists are trying to use to pin down just how quickly the moon is spinning. This image was taken by Cassini on March 19, 2005 when the spacecraft was just 1.3 million km (824,000 miles) away - its second best view of the moon so far.