M31: Chandra's New Light on Dark Energy
CHANDRA’S NEW LIGHT ON DARK ENERGY – CXC
New findings by NASA's Chandra X-ray Observatory in the Andromeda galaxy have provided a major advance in understanding a type of supernova believed critical to studying dark energy. A zoom into this composite image of Andromeda, also known as M31, shows astronomers that the merger of what’s left of two dense stars is the likely cause of many Type Ia supernovas. Type Ia supernovas have been used to measure the accelerated expansion of the universe. Astronomers believe that expansion’s being caused by the dark energy they think pervades the universe – and about which they know very little.
http://www.nasa.gov/multimedia/podcasting/twan_2_19_10.html
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