When sunlight passes through Earth's atmosphere, blue light scatters more easily while red light travels more directly through the air. During a lunar eclipse, some of the sunlight passes all the way through the Earth's atmosphere and reaches the moon's surface, giving it a subtle glow.

The next total lunar eclipse will be on Sept. 7-8, 2025, visible in parts of Asia and Australia, with totality lasting 82 minutes.

The first total lunar eclipse in more than two years lit up the sky last night as humanity, forever fascinated with the Earth’s only natural satellite, watched.