保护地球，探索宇宙，发现文明
2022年1月2日 Quadruple Lunar Halo Over Winter Road Image Credit & Copyright: Dani Caxete Explanation: Sometimes falling ice crystals make the atmosphere into a giant lens causing arcs and halos to appear around the Sun or Moon. One Saturday night in 2012 was just such a time near Madrid, Spain, where a winter sky displayed not only a bright Moon but four r...
2021年02月01日 Lunar Halo over Snowy Trees Image Credit & Copyright: Göran Strand Explanation: Have you ever seen a halo around the Moon? This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal acts like a miniature lens. Because most of the crystals have a similar elongated hex...