... Moving northward in Earth's sky, today the Sun crosses the celestial equator at 13:31 Universal Time bringing Spring to the north and Fall to the south. ... Six years ago, a cluster of three ultraviolet telescopes flew into orbit on the Astro-2 mission aboard the space shuttle Endeavour. ... Rockets and Robert Goddard . ... A Sun Pillar . ... NGC 1818: A Young Globular Cluster . ... Back in the old days, back when our Galaxy first formed, perhaps thousands of globular clusters roamed our Galaxy. ...