流星与对日照
2021年05月12日 A Meteor and the Gegenschein Image Credit: J.C. Casado, StarryEarth, EELabs, TWAN Explanation: Is the night sky darkest in the direction opposite the Sun? No. In fact, a rarely discernable faint glow known as the gegenschein (German for “counter glow”) can be seen 180 degrees around from the Sun in an extremely dark sky. The gegensche...