Photographs from the first days of the Chernobyl disaster and of the aftermath years later show the response, the evacuation ...

COLORADO SPRINGS–Thirteen years ago a 20-m asteroid streaked without warning into Earth’s atmosphere before exploding over the Russian city of Chelyabinsk, injuring 1,500 people and causing widespread ...

After several tests of unusual “nesting doll” satellites in low-Earth orbit, Russia is now fielding operational ...

NASA astronaut Jessica Meir captured a stunning photo of the Lyrids meteor shower from the International Space Station.

Sweden is in talks to send Ukraine the Meteor, Europe's most capable beyond-visual-range air-to-air missile, and it could fundamentally disrupt how Russian jets operate. Here's what the Meteor ...

The asteroid that exploded over Chelyabinsk injured around 1,500 people, damaged thousands of buildings, and exposed an uncomfortable truth: scientists completely missed it, even as they were ...

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Scientists estimate there are thousands of asteroids large enough to destroy a city near Earth. NASA is sending a telescope into space to find them.

Aarti Holla-Maini of the UN’s Office for Outer Space Affairs is primed to spot a potential planetary strike – and a year ago, she thought the moment had come ...