Star trails over ESO telescopes at La Silla

Star trails over ESO telescopes at La Silla

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Caption: Star trails over ESO telescopes at La Silla. Time-exposure image of star trails in the night sky over two of the European Southern Observatory (ESO) telescopes at La Silla, Chile. At left is the Swedish-ESO Submillimetre Telescope (SEST), with the ESO 3.6-metre telescope at right. Star trails form on long-exposure images due to the apparent motion of the stars in the night sky as the Earth rotates. This image is a composite of 250 consecutive one-minute exposures, spanning four hours. SEST was decommissioned in 2003. The ESO 3.6-metre telescope houses HARPS (High Accuracy Radial velocity Planet Searcher), the world's leading exoplanet detector. Photographed in July 2015.

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