A ten-year time-lapse of the entire southern sky

Space · Published 25 October 2026 Swipe more like this →

In short: Most telescopes capture a single, ultra-detailed snapshot of a distant object. The Vera C. Rubin Observatory does the opposite. It acts as a cosmic discovery engine, scanning the heavens repeatedly to build a massive, moving movie of our universe over a decade.

Located on Cerro Pachón in northern Chile at an elevation of 2,680 meters, the Vera C. Rubin Observatory is designed for wide-field survey astronomy. Unlike space telescopes like Hubble or James Webb, which focus on deep, narrow fields, Rubin's mission—the Legacy Survey of Space and Time (LSST)—is built for speed and scale. It captures 15-30 second exposures every 30-40 seconds, slewing quickly between targets to compensate for the Earth's rotation while mapping the southern sky.

The core mechanism of Rubin is its ability to detect change. By revisiting the same regions repeatedly over a 10-year period, it creates a time-lapse that allows scientists to identify moving asteroids, exploding stars, and variable objects. It functions as a primary scout for the global scientific community: when it detects something new or shifting, it generates millions of alerts. These signals tell other instruments where to point their high-resolution lenses to zoom in on specific phenomena.

The sheer volume of data is staggering. Every night, the observatory produces 10 terabytes of information. From this stream, Rubin will generate yearly catalogues containing 20 billion galaxies, 17 billion stars within our own Milky Way, and millions of objects in our solar system. By merging various photos from a single location, the software eliminates glitches like satellite trails to maintain data accuracy.

This project is a joint initiative between the U.S. National Science Foundation (NSF) and the Department of Energy’s Office of Science, operated by NSF NOIRLab and SLAC National Accelerator Laboratory. It represents a shift toward 'discovery engines'—facilities that provide the broad context necessary to find the needles in the cosmic haystack.

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