The Vera C. Rubin Observatory has made a groundbreaking discovery, identifying asteroid 2025 MN45 as the fastest-spinning large asteroid ever observed. Measuring approximately 710 meters (0.44 miles) in diameter, this celestial body completes a full rotation every 1.88 minutes, or roughly 113 seconds. This remarkable rotation speed sets a new record for asteroids over 500 meters in size, surpassing previous known rotational limits for objects of this scale. The discovery was made during the Rubin Observatory's 'First Look' observations in April and May 2025, a commissioning phase before its primary 10-year Legacy Survey of Space and Time (LSST) formally commences. The findings, published in The Astrophysical Journal Letters on January 7, 2026, represent the first peer-reviewed scientific paper utilizing data from Rubin's powerful LSST Camera, the world's largest digital camera. Scientists believe the asteroid's extreme spin rate indicates it must be composed of unusually strong, solid rock, rather than the more common 'rubble pile' structure typically associated with asteroids. This challenges existing theories about asteroid formation and internal composition, offering crucial new clues about how these ancient space rocks formed and evolved in our solar system. The discovery of 2025 MN45, along with 18 other newly identified fast-rotating asteroids, highlights the Rubin Observatory's unique capability to detect previously unobservable phenomena.