Trump's renewed firmness on that deadline came after he posted a flurry of letters warning world leaders, threatening to ...

Images of the cosmos, such as the James Webb Space Telescope’s deep space snapshot, make space look chock-full of stuff. In ...

China warned President Trump on Tuesday against restarting trade tensions and that it would hit back at countries that make ...

How did Earth, alone among the solar system's rocky planets, become the home for life? How, among all this frigid ...

NASA astronaut Nichole Ayers photographed a rare atmospheric phenomenon over the US and Mexico known as a "sprite" that's associated with lightning.

Join us on an unforgettable expedition to the summit of Aconcagua, the highest mountain in the Americas at 6,962 meters (22,834 feet). Battling fierce winds, freezing temperatures, and the thin air of ...