1280px-The_VLT_s_Laser_Guide_Star.jpg | Naked Scientists

A laser beam launched from VLT´s 8.2-metre Yepun telescope crosses the majestic southern sky and creates an artificial star at 90 km altitude in the high Earth´s mesosphere. The Laser Guide Star (LGS) is part of the VLT´s Adaptive Optics system and...

Credit:

CC-BY - G. Hüdepohl/ESO

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