Vera C. Rubin Observatory Releases First-Light Images: LSST Decade Survey Begins, 20 TB per Night

The Vera C. Rubin Observatory, perched on Cerro Pachón in Chile, has released its first official science images and formally begun the Legacy Survey of Space and Time (LSST) - a decade-long campaign to image the entire southern sky every few nights. The first batch of images includes a deep field, a wide-area southern sky view, a globular cluster, and a swath of distant galaxies.

The Telescope in Numbers

• Primary mirror: 8.4 meters, the largest digital camera ever built for astronomy
• Camera: 3,200 megapixels (3.2 gigapixels), built at SLAC National Accelerator Laboratory
• Field of view: 9.6 square degrees per exposure - about 40 times the area of the full moon
• Cadence: each patch of sky revisited every few nights for ten years
• Data rate: ~20 TB per observing night, ~500 PB total over the survey

"We are about to watch the sky change in real time. Every asteroid, every supernova, every flicker of a distant star - we will see it," said Željko Ivezić, director of Rubin construction.

Why LSST Matters

The survey has four primary science drivers: mapping dark matter via weak gravitational lensing, constraining dark energy through type Ia supernovae, building a census of small solar-system bodies, and mapping the structure of the Milky Way. Each of these requires the kind of deep, wide, fast, repeated imaging that only Rubin can deliver.

The First-Light Images

The first official pictures released include:

• Trifid and Lagoon Nebulas: a 5-hour color composite showing faint structures invisible to previous surveys
• The Virgo Cluster: thousands of galaxies captured in a single exposure
• A globular cluster: stars resolved down to the main sequence in a fraction of the time required by Hubble

Data Plumbing for 20 TB a Night

Rubin's data flow is itself an engineering project. Pipelines run at SLAC, in the U.K., and at NCSA, generating alerts within 60 seconds for transient events. A new alert stream - already active during commissioning - has been firing at a rate of ~10 million events per night, and operators expect the cadence to climb sharply as the survey enters full swing.

What Comes Next

The survey begins full operations in October 2026 after a brief engineering pause. By the end of the first year, astronomers expect Rubin to have discovered more transients than every previous telescope in history combined.