Forecasts call for mild auroral activity Monday night that will weaken by Tuesday, when no states in the contiguous U.S. are ...

The Northern Lights are one of the most beautiful, yet elusive spectacles in the world. It can be difficult to see them, even ...

NASA scientists said the moon will block out about 22% of the sun, but the timing and duration will depend on where you are.

A few months ago, Greenland was quietly getting on with winter, as the territory slid deeper into the darkness that envelops the world’s northerly reaches at this time of year. But President Donald ...