Oftentimes, we think of space as an endless, mostly empty vacuum, a silent backdrop where planets, stars, and galaxies play out their dance. We also think of time as something separate, a steady ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...

Archaeologists have studied how astronauts use the International Space Station to improve its potential future successors.

Since the first crew of astronauts reached the International Space Station on Nov. 2, 2000, humanity has had a continuous ...

The ISS has “come into its own as a very sophisticated scientific laboratory,” says retired NASA astronaut Scott Kelly, who ...

Follow the space program since the moon landing in the four-part documentary "Once Upon a Time in Space". Here’s how to watch ...