保护地球，探索宇宙，发现文明
2023年2月26日 Saturn’s Iapetus: Moon with a Strange Surface Image Credit: NASA, ESA, JPL, SSI, Cassini Imaging Team Explanation: What would make a moon look like a walnut? A strange ridge that circles Saturn’s moon Iapetus’s equator, visible near the bottom of the featured image, makes it appear similar to a popular edible nut. The origin of t...
2021年7月13日 Saturn’s Iapetus: Painted Moon in 3D Image Credit: NASA, ESA, JPL, SSI, Cassini Imaging Team; 3D Rendering: NASA’s VTAD Explanation: What has happened to Saturn’s moon Iapetus? Vast sections of this strange world are dark brown, while others are as bright white. The composition of the dark material is unknown, but infrared spectr...