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45.0 x 27.9 cm ⏐ 17.7 x 11.0 in (300dpi)
BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Milky Way, VLT telescopes and laser guide. The southern Milky Way (left) over the four main telescopes of the Very Large Telescope (VLT) interferometer in Chile's Atacama Desert, on Cerro Paranal at an altitude of 2600 metres. One of the world's most powerful telescopes, the four 8-metre telescopes are (from left): Antu, Kueyen, Melipal, and Yepun. The Laser Guide Star Facility (PARSEC) produces an orange beam (far right) to create a guide star in the atmosphere. Operating since January 2006, the artificial guide star is used to calibrate the VLT telescopes to remove the effects of the atmosphere on observations, a process known as adaptive optics.
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