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Rubin Observatory releases first LSST image: 500k+ galaxies in COSMOS field

NSF-DOE facility's 3.2-gigapixel camera captures deepest view yet of famous cosmic region, marking first science data release.

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Summary, timeline and people extracted by Claude from 5 items across 3 sources · 7h ago. Quotes are verbatim.

The NSF-DOE Vera C. Rubin Observatory released its first LSST Camera image on July 31, 2026, featuring over 500,000 galaxies and tens of thousands of stars in the COSMOS field, a well-studied region in the constellation Sextans. The image was created by stacking hundreds of observations with the world's largest digital camera mounted on the 8.4-meter Simonyi Survey Telescope, and will serve as a reference point for validating the observatory's data while complementing decades of prior observations from other telescopes. Rubin will observe COSMOS repeatedly over its ten-year Legacy Survey of Space and Time mission to track changes in the sky and study galaxy evolution across cosmic time.

  • Rubin Observatory's first LSST Camera science release on July 31, 2026 captured over 500,000 galaxies and 50,000+ stars in a single stacked image of the COSMOS field using the world's largest digital camera (3.2 gigapixels).
  • COSMOS field is a reference standard for astronomy having been studied extensively since Hubble's 2003 observations; Rubin's new data validates measurements and complements prior multi-wavelength observations across the spectrum.
  • Rubin will observe COSMOS repeatedly over its ten-year Legacy Survey of Space and Time mission to track sky changes over time and study galaxy evolution, providing unprecedented cinematic record of the universe.
  • The COSMOS field's location away from the Milky Way's plane allows telescopes to see enormous numbers of distant galaxies with minimal stellar and dust interference, enabling study of the universe's history.

How it unfolded

  1. Report Nautilus article emphasizes scientific significance

    Nautilus magazine publishes detailed coverage noting the image captured over 650,000 galaxies and director Bob Blum's statement on upcoming repeated observations to study transient objects.

  2. Report Coverage spreads to international media

    Stories appear in Google News outlets including The Daily Star and French science publication Futura, highlighting the 500,000+ galaxies captured in a single image.

  3. Report Story gains traction on Hacker News

    The Rubin Observatory announcement reaches 107 points on Hacker News with discussion of the 500k galaxy detection in COSMOS.

  4. Event Rubin releases first LSST Camera image and catalog

    NSF-DOE Rubin Observatory releases its first LSST Camera science image and catalog, featuring over 500,000 galaxies and 50,000+ stars in the COSMOS field, created from stacked observations.

  5. 135 weeks quiet
  6. Event Rubin Observatory camera comes online

    The 3.2-gigapixel LSST Camera, the world's largest digital camera, becomes operational at the Vera C. Rubin Observatory in Chile.

  7. 1096 weeks quiet
  8. Event Hubble Space Telescope observes COSMOS field

    The COSMOS field is first photographed by the Hubble Space Telescope, beginning two decades of extensive multi-wavelength observations by telescopes worldwide.

What people are saying verbatim

“The COSMOS deep image is just the beginning for Rubin in this region. Repeated visits to the field over the next few years will demonstrate the power of our survey design for discovery by providing our science community with a huge number of transient and variable objects like supernovae and other explosive transients for follow-up and detailed study.”

Bob Blum, Rubin Observatory director · Nautilus · Aug 8

“Packed into this single image from Rubin Observatory are many different kinds of galaxies: spirals with delicate arms, smooth elliptical galaxies, distorted merging galaxies, and faint red galaxies from the distant Universe.”

NSF-DOE Vera C. Rubin Observatory, Institution · Rubin Observatory official announcement

“Looking deeper into space also means looking farther back in time, allowing scientists to study galaxies at many different stages in the history of the Universe.”

NSF-DOE Vera C. Rubin Observatory, Institution · Rubin Observatory official announcement