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Astronomers observed SN 2021yfj, a stripped-down supernova whose progenitor shed hydrogen, helium, and carbon before exploding, leaving an exposed silicon/sulfur core (Nature, Aug 20, 2025). NASA’s James Webb Space Telescope spotted a previously unknown inner moon of Uranus, about 6 miles (10 km) across, bringing the planet’s known moons to 29. NASA and IBM unveiled Surya, an AI foundation model trained on nine years of Solar Dynamics Observatory data that forecasts solar flares up to two hours in advance and improves prediction benchmarks by 16%. OSIRIS-REx Bennu samples show Bennu is a mosaic of dust from near the Sun, interstellar