These NASA scientists stumbled upon a “city under the ice” in Greenland, decades after it was abandoned during the Cold War.

Another eclipse should be visible before the end of March. Here's when astronomers say this event will be best seen.

A partial solar eclipse on March 29 will be visible from parts of North America. Here's how to safely view the cosmic event, even if you can't be there in person.

The country supports some of the world’s most important satellites. But experts worry about its proximity to Russia.

Moving, tragic, surprising, inspiring, terrifying, shocking... This is a selection of images from our planet, over the past ...