Apr 112013
Anne's Picture of the Day: Spiral Galaxy Messier 83

April 11, 2013 Messier 83, a barred spiral galaxy in Hydra Image Credit: ESO Messier 83 (also known as NGC 5236 and the Southern Pinwheel for its majestic spiral arms) is a barred spiral galaxy of some 40,000 light-years across, located about 14.7 million light-years away in the southern constellation of Hydra, the Water-Snake, while [continue reading]

Mei 062012
Mystery X-ray source in distant galaxy - video

  Since the 1980s, astronomers have known about a mysterious class of objects that they call “ultraluminous X-ray sources,” or ULXs. They named them this because these objects give off more X-rays than most other binary star systems where black holes or neutron stars are in orbit around a normal companion star. Recently, scientists using [continue reading]

Mei 012012
NASA's Chandra Sees Remarkable Outburst From Old Black Hole

  An extraordinary outburst produced by a black hole in a nearby galaxy has provided direct evidence for a population of old, volatile stellar black holes. The discovery, made by astronomers using NASA’s Chandra X-ray Observatory, provides new insight into the nature of a mysterious class of black holes that can produce as much energy [continue reading]