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Here's an old pic I took back in 2019, showing the UT4 telescope at ESO's Paranal Observatory shooting its four mighty lasers. These lasers excite sodium atoms high up in the atmosphere, creating fake "stars" that we monitor in real time to measure and correct atmospheric turbulence, thus yielding very sharp images.

The two faint smudges flanking UT4 are he Andromeda (left) and Triangulum (right) galaxies.

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