hidden moon

Astronomers observed SN 2021yfj, a stripped-down supernova whose progenitor shed hydrogen, helium, and carbon to reveal an exposed silicon/sulfur core, with the Nature report published on August 20, 2025. NASA’s James Webb Space Telescope spotted a previously unknown inner moon orbiting 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 Solar Dynamics Observatory data, capable of predicting solar flares up to two hours in advance and beating benchmarks by about 16%. A Nature study led by Nerilie Abram warns Antarctic sea ice loss could