Optical CCD image of the double quasar 0957+561

Optical CCD image of the double quasar 0957+561

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Credit: DR RUDOLPH SCHILD/SCIENCE PHOTO LIBRARY

Caption: Optical CCD image of "double quasar" 0957+561. The quasar is a single object 10 million light years away. It is seen as two images (outlined in box, with enlargement inset) because its light is bent when it passes close to an intervening galaxy (not visible) which acts as a "gravitational lens". The 1979 discovery of 0957+561, the first double quasar found, confirmed the predicted bend- ing of light by gravity in Einstein's General Theory of Relativity. The 3 bright spots are fore- ground stars in our own galaxy. The image was made by a CCD (Charge Coupled Device) camera mounted on a telescope at the Whipple Observatory, Arizona.

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Keywords: 0957+561, astronomy, cosmology, double, double quasar 0957+561, gravitational lens, proof, quasar, relativity, science

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