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Stellar Ripple | Approximately 100 million years ago, a smaller galaxy plunged through the heart of the Cartwheel galaxy, creating ripples of brief star formation. In this image, the first ripple appears as an ultraviolet-bright blue outer ring so powerful that it may be one of the most powerful UV-emitting galaxies in the nearby universe.
The Farthest Object in the Universe
Giant Arc of Light --A Mystery Observed Behind a Super-Massive Galaxy 10 Billion Light Years Away June 27, 2012 Astronomers using NASA's Hubble Space Telescope have found a puzzling arc of light behind an extremely massive cluster of galaxies residing 10 billion light-years away.