Scientific American13 小时
Saturn’s Rings Are Disappearing—But They’ll Be Back
Saturn’s rings, imaged here by NASA’s Cassini orbiter, are one of the solar system’s most reliably spectacular sights. But ...
Rare Comet Flies Close To Sun In 'Near-Death Encounter'; It Will Return 1,60,000 Years Later
This comet, named ATLAS after the Asteroid Terrestrial-impact Last Alert System that discovered it, reached an extraordinary ...