The Secret Behind Light's Journey Through Space Visible light travels in electromagnetic waves, which we see as the colors of ...

A total lunar eclipse delighted stargazers overnight on Sept. 7-8 with a spectacular display of orbital mechanics that briefly turned Earth's natural satellite blood red. This week's total lunar ...

Skywatchers across the world will witness the first total lunar eclipse in three years. Here’s who will have the best views—and what gives the moon its eerie red tint. People gather to watch a “blood ...