... Gazing across this gorgeous skyscape, the Southern Cross and stars of the constellation Centaurus are seen above the outline of Mauna Loa (Long Mountain), planet Earth's largest volcano. ... Monitoring a region around the center of our Galaxy, astronomers have indeed found evidence for a surprisingly large number.. ... First Launch of the Delta IV Heavy . ... NGC 6946: The Fireworks Galaxy . ... Nearby spiral galaxy NGC 6946 is undergoing a tremendous burst of star formation with no obvious cause. ...