The phases of the lunar eclipse are visible in this time-lapse image of the Moon above the Space Environments Complex at NASA’s Glenn Research Center at NASA’s Neil Armstrong Test Facility in Sandusky, OH on March 14, 2025.
Toward the middle of the Moon’s track through the sky, it appears red – this is the Blood Moon. One meaning of a “Blood Moon” is based on its red glow. This blood moon occurs during a total lunar eclipse. During a total lunar eclipse, Earth lines up between the Moon and the Sun, hiding the Moon from sunlight. When this happens, the only light that reaches the Moon’s surface is from the edges of the Earth’s atmosphere. The air molecules from Earth’s atmosphere scatter out most of the blue light. The remaining light reflects onto the Moon’s surface with a red glow, making the Moon appear red in the night sky.
Image credit: NASA/Sara Lowthian-Hanna
2025年3月14日，在美国俄亥俄州桑达斯基的NASA尼尔·阿姆斯特朗测试设施内的格伦研究中心空间环境综合体上方，这张延时摄影图像展示了月食的各个阶段。
在月亮在天空中运行到中间位置时，它呈现出红色——这就是血月。血月这一名称的含义之一来源于其红色光辉。这次血月发生在月全食期间。月全食时，地球位于月球和太阳之间，遮挡了来自太阳的直射光。当这种情况发生时，唯一能到达月球表面的光线来自地球大气层的边缘。地球大气中的空气分子会散射掉大部分蓝光，而剩余的光线则带着红色的光辉反射到月球表面，使得月亮在夜空中呈现出红色。
图片来源: NASA/Sara Lowthian-Hanna
