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Image Astro du jour
Today’s Picture of the Week shows the full scope of Paranal’s beauty. Cerro Paranal in Chile’s Atacama Desert, the mountain peak home to ESO’s Very Large Telescope (VLT), is a site of many marvels. And this panoramic image taken by Chilean astrophotographer Alexis Trigo certainly captures them all.
Right in front, one of the movable Auxiliary Telescopes (ATs) stands tall. While this "relatively" small 1.8-m telescope has its eyes shut, its bigger siblings, the Unit Telescopes (UTs), each with an 8.2-m mirror, are scanning the sky. The lasers emerging from the UTs each create a bright artificial star on the sky, so the shifts and swirls of the atmosphere can be measured and corrected to deliver sharp data.
The UT4 telescope, seen here to the right, had been equipped with four lasers for several years already. But in November 2025, when this image was taken, additional lasers were being tested in the other three UTs. These new lasers are part of an upgrade to the VLT Interferometer (VLTI) and its GRAVITY instrument, called GRAVITY+. The four UTs can work together as a huge virtual telescope, and these new lasers will allow them to observe much fainter objects than before.
But the telescopes are not the only marvel that stands out in this picture: the dark sky in the background is just as striking, with the centre of the Milky Way shining to the left. This view is unfortunately polluted by many “scratches” caused by satellite megaconstellations, a growing threat for astronomy that ESO is working hard to mitigate.