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 ...

Sending anything to Mars is a much more difficult process than it seems. In the 1960s, the Soviet Union tried (and failed) in its first nine consecutive attempts, and the US was only able to succeed ...