International Space Station, where astronauts have lived and worked for 25 years, is visible to us on Earth. How to see it ...

Though sci-fi movies would have us believe that space is incredibly cold — even freezing — space itself isn't exactly cold. In fact, it doesn't actually have a temperature at all. Temperature is a ...

On a clear night far from city lights, the Milky Way stretches overhead as a pale band, yet most of the sky between those ...

"We used to think that only very simple molecules could be created in these clouds. But we have shown that this is clearly ...

Is the universe infinite? It's one of the most profound questions we can ask, and here's the short answer: We don't know. While we have learned a great deal about the universe, a portion of the cosmos ...

As humans prepare for longer missions to the moon and Mars, scientists are trying to understand how space affects the human body. One of the biggest concerns is space radiation — high-energy particles ...