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…
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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.…
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