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2014-01-31 07:40:01

The ESO Very Large Telescope (VLT) during observations. A reddish laser beam is launched to create an artificial star at an altitude of 90 km in the Earth´s mesosphere. This Laser Guide Star (LGS) allows astronomers to remove the effects of atmospheric turbulence, producing images almost as sharp as if the telescope were in space.

Image uploaded by Robert Myles
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