A gibbous Moon (three quarter full) rises over the erupting steam and ash plume at the summit of Kilauea Volcano in Hawaii. Kilauea, a shield volcano on Hawaii's Big Island, is one of the world's most active volcanoes. In the late 19th and early 20th century, the summit caldera region was almost continuously active. Since the 1950s, Kilauea has had more than 35 eruptions. The activity shown here is from a new vent that began erupting ash and steam in March 2008.