How the largest digital camera ever made is revolutionizing our view of space

Yahoo

29-06-2025

Last Thursday, I took my son to the Rose Center for Earth and Space at New York's Museum of Natural History. In the Hayden Planetarium, we watched a simulation of the Milky Way bloom above us, while the actor Pedro Pascal — who truly is everywhere — narrated the galactic dance unfolding on the screen.
It was breathtaking. But it didn't compare to what was blasted around the world just a few days later, as the new Vera C. Rubin Observatory began broadcasting its 'first light' — its inaugural images of the cosmos. I found myself pinching-to-zoom through a picture that contains roughly 10 million galaxies in a single frame, a vista so vast it would take 400 4-K TVs to display at full resolution. I could hold the universe itself on my screen.
Perched 8,660 feet up Cerro Pachón in the Chilean Andes, where the crystal-clear nights provide an exceptionally clear window into space, the Vera C. Rubin Observatory began construction in 2015 with funding from the US National Science Foundation (NSF) and the US Department of Energy. Named for the pioneering astronomer Vera Rubin, whose work on galaxy rotation helped prove the existence of dark matter, the observatory was built to run a single, audacious experiment: the 10-year Legacy Survey of Space and Time.
It will photograph the entire Southern Hemisphere sky every few nights to tackle four grand goals: unmask dark matter and dark energy, inventory the Solar System's asteroids and comets, chart the Milky Way's formation, and capture every transient cosmic event.
What makes Rubin so special is its eye, which is a marvel. At its core is a 27-foot-wide dual mirror cast from 51,900 pounds of molten glass that is still light enough to sweep across the sky in seconds. The mirror directs a flow of light from the cosmic depths to the 3.2-gigapixel LSST Camera, a 5-by-10-feet digital jumbotron that is the largest digital camera ever made. It's like a massive magnifying glass paired with the world's sharpest DSLR: Together they capture a swath of the night sky equivalent to 45 full moons every 30 seconds.
And those images, which will be continuously shared with the world, are jaw-dropping. The headlining shot from Rubin's debut, nicknamed 'Cosmic Treasure Chest,' stitches together 1,185 exposures of the Virgo Cluster, our nearest major collection of galaxies, some 55 million light-years away.
But the Rubin Observatory is about much more than producing pretty cosmic wallpaper. Its unprecedented scale gives it the ability to search for answers to grand questions about space science. The NSF notes that Rubin will gather more optical data in its first year than all previous ground telescopes combined, turning the messy, ever-changing sky into a searchable movie.
As I've written before, the world has made great strides in planetary defense: Our ability to detect and eventually deflect asteroids that could be on a collision course with Earth. Rubin has already begun paying dividends toward that goal.
In a mere 10 hours of engineering data, its detection software identified 2,104 brand-new asteroids — including seven near-Earth objects, heavenly bodies whose orbit will bring them near-ish our planet.
That haul came from just a thumbnail-sized patch of sky; once Rubin begins its nightly scan of the whole Southern Hemisphere, it's projected to catalog over 5 million asteroids and roughly 100,000 NEOs over the next decade, tripling today's inventory. That will help NASA finally reach its congressionally mandated target of identifying 90 percent of the 25,000 city-killer-class NEOs (those over 140 meters) estimated to be out there.
How powerful is Rubin's eye? 'It took 225 years of astronomical observations to detect the first 1.5 million asteroids,' Jake Kurlander, a grad student astronomer at the University of Washington, told Earth.com. 'Rubin will double that number in less than a year.'
And the images that Rubin captures will go out to the entire world. Its Skyviewer app will allow anyone to zoom in and out of the corners of space that catch Rubin's eye, including celestial objects so new that most of them don't have names. Looking at the app gives you a sense of what it must have been like to be one of the first human beings, gazing up at a sky filled with wonder and mystery.
It might seem strange to highlight a telescope at a moment when the world feels as if it is literally on fire. But the Vera Rubin Observatory isn't just a triumph of international scientific engineering, or an unparalleled window on the universe. It is the ultimate perspective provider.
If you open the Virgo image and zoom all the way out, Earth's orbit would be smaller than a single pixel. Yet that same pixel is where thousands of engineers, coders, machinists, and scientists quietly spent a decade building an eye that can watch the rest of the universe breathe, and then share those images with all of their fellow humans.
Seeing Rubin's images brought to mind the lines of Walt Whitman's 'When I Heard the Learn'd Astronomer.'
I wander'd off by myself,
In the mystical moist night-air, and from time to time,
Look'd up in perfect silence at the stars.
On days when life on our little world feels chaotic, Rubin's first-light view offers a valuable reminder: We're just one tiny part in a tapestry of 10 million galaxies, looking up from our planet at the endless stars.
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