ESPRESSO spectrograph testing

ESPRESSO spectrograph testing

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Caption: ESPRESSO spectrograph testing. Engineer in a clean room testing the diffraction grating for ESPRESSO (Echelle Spectrograph for Rocky Exoplanet and Stable Spectroscopic Observations), an advanced exoplanet detection technology. The grating is among the largest ever made. When installed in 2016, ESPRESSO will combine the light from all four Unit Telescopes of the European Southern Observatory (ESO)'s Very Large Telescope (VLT) to create a virtual 16-metre aperture telescope. Applications include the study of the light from distant quasars to test whether the constants of nature vary over time. Photographed in September 2015, at ESO Headquarters in Garching, Germany.

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