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Image Astro du jour
The dark sky provides the perfect backdrop for today's Picture of the Week, captured by Chilean astrophotographer Alexis Trigo. The spotlight is on the magnificent Unit Telescope 4, also known as Yepun, part of ESO’s Very Large Telescope (VLT), reaching for the stars with its laser beams. Behind it, the Milky Way stretches low in the horizon.
The VLT comprises four Unit Telescopes, each with an 8.2 m mirror. All four UT domes are as big as a family house, keeping the telescope safe and sound from all environmental conditions. But despite their similarities, Yepun is special, as it is the only UT with a total of four lasers.
Lasers create an artificial star in Earth's upper atmosphere, allowing astronomers to correct for atmospheric turbulence that blurs their data. Initially, only UT4 had lasers installed, but this changed recently with the completion of the GRAVITY+ upgrade to the VLT Interferometer. Now, a laser has been installed on all the other three UTs. Nevertheless, Yepun remains distinctive with its four lasers, delivering crystal-clear views of the cosmos.