Intuitively, we know what time is, but try to explain it, and we end up tying our minds in knots. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

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 ...

We experience the flow of time because it’s a natural outcome of the basic laws of physics. But we may need to build a whole ...

A decades-old idea is quietly regaining attention in theoretical physics: ancient structures embedded in the universe’s ...

The original version of this story appeared in Quanta Magazine. At the beginning of time and the center of every black hole lies a point of infinite density called a singularity. To explore these ...

MIT astronauts aboard the International Space Station—and the MIT researchers who have sent up experiments—have advanced our understanding of science, space, and the universe. On November 2, 2000, ...

Can we journey through time? Sci-fi author Dete Meserve presents a compelling case for our future in the past. When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

Daryl Janzen does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...