... Cosmic Collisions in a Galaxy Cluster . ... Eight billion light-years away, the cluster is among the most distant known clusters of galaxies and is now reported to contain the largest number of colliding galaxies ever found in a cluster. ... Moon Rocket . ... On July 20, 1969, only four days after leaving planet Earth 250,000 miles behind them, Apollo 11 astronauts landed on the moon - the first humans to reach another celestial body. ... NGC 3372: The Great Nebula in Carina . ... First page ] Prev....