... The inset frame of Jupiter's most active moon was taken by the robot spacecraft Galileo in April. Just last month the larger image was taken. The new large black spot reveals that a volcano named Pillan Patera has been erupting during the interim. ... Blue Stagglers in Globular Clusters . ... Irregular Moons Discovered Around Uranus . ... Last week two previously undiscovered moons of the distant gas planet were confirmed, the first in irregular orbits. ... M31: The Andromeda Galaxy . ...