The Vera C. Rubin Observatory, located in Chile, has made a significant astronomical discovery by identifying asteroid 2025 MN45 during its preliminary observations. This enormous space rock, estimated to be about 2,300 feet (710 meters) wide – roughly the size of eight football fields or larger than most skyscrapers – is notable for its record-breaking rotational speed. It completes a full rotation every 1.88 minutes (113 seconds), making it the fastest-spinning asteroid known with a diameter exceeding 500 meters (1,640 feet). The discovery was made using data collected over just seven nights of observations during the observatory's commissioning phase, prior to the formal commencement of its ten-year Legacy Survey of Space and Time (LSST), which is slated to begin in early 2026. The initial dataset, released during the Rubin Observatory's 'First Look' event in June 2025, included nearly 2,000 newly identified asteroids, with 2025 MN45 emerging as a highlight. This rapid rotation suggests that 2025 MN45 is likely composed of solid rock rather than being a 'rubble pile' held together by gravity, as is characteristic of many asteroids. This characteristic makes the asteroid a valuable object for studying the formation and evolution of our solar system. The findings, led by astronomer Sarah Greenstreet, were published in The Astrophysical Journal Letters and presented at the American Astronomical Society's winter meeting. The discovery showcases the unprecedented capabilities of the Rubin Observatory's 3.2-billion-pixel LSST Camera, the world's largest digital camera, in detecting and characterizing distant celestial bodies.