Large Synoptic Survey Telescope

To reach the top of Cerro Pachón, a mountain at the edge of the Atacama Desert in Chile, astronomers take a drive of two hours up a winding, bumpy road. The lush greenery at the mountain’s base slowly gives way to the browns and yellows of the desert. Eventually, telescopes rise in the distance, the sun glinting off their metal domes.The newest eye on the cosmos is the Vera C. Rubin Observatory, which houses the largest digital camera ever built. For the next 10 years, the telescope will take advantage of its station under Chilean skies, some of the darkest on Earth, to conduct an astronomical survey more ambitious than any scientific instrument that came before it.From that survey, astronomers hope to learn about the birth of our Milky Way galaxy, the mysterious matter comprising much of the cosmos, and how the universe evolved into its current arrangement. Perhaps they will even uncover clues about its fate.They will also use the telescope to home in on millions of transient objects, “faint things that go bang, explode or move in the night,” said Tony Tyson, an astrophysicist at the University of California, Davis. That includes gorging black holes and collisions of dense, dead stars.The Rubin Observatory; a camera integration area; the view through the Rubin Auxilary Telescope of the Vera C. Rubin Observatory.But the most valuable discoveries, astronomers say, lie beyond the reaches of their imagination.“The universe always throws us surprises,” said Michael Strauss, an astrophysicist at Princeton University. With Rubin, he said, “we don’t yet know what those surprises will be.”Rubin’s 3.2 Gigapixel CameraAt the heart of the Rubin observatory is the largest digital camera in the world, a supercooled grid with hundreds of high-resolution sensors. See how the camera works. More