The coldest and densest molecular gas clouds in the interstellar medium can have temperatures of 10 K (-505 °F/-263 °C), ...

It takes a beam of light a single day to travel 16.1 billion miles, a distance known as a light-day. It'll take Voyager 1, the American spacecraft moving at 10.6 miles per second, more than 49 years ...

Even in space, what goes up sometimes comes back down: spent rocket stages, defunct satellites and other bits of space debris ...

A study has cast doubt on the idea that Jupiter's moon Europa, where NASA has sent a spacecraft, could have conditions to ...

For the first time since humans began living in orbit, the International Space Station has every docking port filled, with eight visiting spacecraft clustered around its truss and modules like cars in ...