Here’s how it works. On March 17, 2015, a blood-red arc of light cut through the sky hundreds of miles above New Zealand. Over the next half hour, an amateur skywatcher observed that arc as it ...

A river of hazy red light stretched across the night sky over Denmark after the most powerful solar storm to hit Earth for six years slammed into our planet. The rare phenomenon is not an aurora.

A spectacular celestial event is scheduled to appear in the night sky this week that will have astronomers and stargazers focusing their eyes upward in awe. A rare blood-red lunar eclipse ...