Free Astronomy Magazine September-October 2026

21 SEPTEMBER-OCTOBER 2026 ASTRO PUBLISHING time-rich views needed to uncover subtle events, capture moving ob- jects, and study the accelerating ex- pansion of the Universe. Not only is Rubin helping to unlock the mysteries of the distant Uni- verse, it is also the most powerful Solar System discovery machine ever built. By taking about a thousand images every night, Rubin is compil- ing an astonishingly detailed census of our Solar System, including mil- lions of asteroids and comets. In just a month and a half, during early optimization surveys, Rubin discov- ered over 11,000 never-before-seen asteroids, including 33 near-Earth objects and 380 trans-Neptunian objects. Rubin will also advance op- portunities for multi-messenger as- tronomy, which is the study of cosmic events using multiple signals such as light, gravitational waves, and cosmic rays. The observatory’s rapid, color-rich observations of transients such as stellar explosions, actively feeding black holes, and collisions between compact objects will guide tele- scopes around the world to follow up on these fleeting events. Each night, Rubin is collecting ap- proximately ten terabytes of data and producing as many as seven million alerts of changes in the night sky. These alerts stream to alert brokers — automated systems that sort and classify these changes so scientists can act quickly. When the LSST is complete, the final dataset will contain billions of ob- jects with trillions of measurements, all accessible through regular data releases. This is the first time so much astronomical data will be available to so many people, open- ing the door to new kinds of discov- ery by both scientists and the public. Rubin invites anyone in the world to engage with its data and explore the dynamic Universe in ways never before possible. H ow much sky can Rubin observe in a single week? This map shows a repre- sentative week of Rubin Observatory observations for the Legacy Survey of Space and Time. The color of the tile represents the filter used for each ex- posure (u, g, r, i, z, and y), revealing how Rubin rapidly builds a multicolor map of the Universe. [NSF–DOE Vera C. Rubin Observatory/NOIRLab/SLAC/AURA] sion included image quality, effec- tive survey speed, system uptime and reliability, and calibration accu- racy. Rubin Observatory’s unique de- sign combines enormous light-col- lecting power, the ability to move rapidly across the sky, and a wide field of view. Its 3200-megapixel camera — the largest digital camera in the world — is now capturing a new, detailed image approximately every 40 seconds. Operating with this speed and sensitivity, Rubin functions as a unified, well-tuned system capable of catching faint ob- jects and fleeting events with re- markable reliability and consistency every night. Rubin is bringing the Universe to life, illuminating a treas- ure trove of discoveries: pulsating stars, supernova explosions, the fos- sil record of galaxies, clues to the mysteries of dark energy and dark matter, and entirely new phenom- ena we’ve never seen before. Some cosmic processes unfold slow- ly, unpredictably, or incredibly rare- ly, which is why a ten-year survey is essential. By returning to each point in the sky about 800 times over a decade, Rubin data is providing the scientific community with deep, !