For its 19th anniversary, the Hubble Space Telescope has shot the peculiar group of galaxies Arp 194.
Astronomers have spotted a rare, complex cosmic collision of four galaxy clusters. A spectacular composite image from NASA's Chandra X-Ray Observatory and Hubble Space Telescope revealed the pileup—and its likely source.
Should a rocket blast off on schedule early Tuesday evening, May 5, 2009, from NASA's Wallops Island Flight Facility in Virginia, a potentially spectacular sight might be visible across a wide swath of the U.S. Eastern Seaboard.
To understand how the modern Universe came to be, astronomers turn to computer models, programs that follow the physical laws of the Universe. Scientists use these models to understand the formation and evolution of galaxies and quasars in the universe.