NASA probe finds 'the big empty' in Saturn's planet-ring gap
NASA's Cassini spacecraft, the first man-made object to go between Saturn and its rings, has found the region to be less dusty than expected. NASA called the 2,400-km-wide planet-ring gap "the big empty" as Cassini detected almost no particle hitting it during the first dive. NASA converted data from Cassini's instruments to audio to hear for particles hitting the spacecraft.