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An artist's illustration of the black hole at the heart of a quasar in the distant universe. The biggest black hole known to exist lives in the nearby galaxy M87. It's 2,000 times bigger than the Milky Way's supermassive black hole.
NASA's Messenger reveals close-ups of Mercury's sun-scorched surface
Nasa has released an image taken by the probe's Visual and Infrared Spectrometer (Virs) to reveal distinct features such as volcanic vents and fresh craters. To highlight the geological features, the images have been overlain on a black and white mosaic from the Mercury Dual Imaging System (MDIS)