Today, the deepest depths of intergalactic space aren’t at absolute zero, but at a chill 2.73 K. How does that temperature change over time?

In all directions, at great distances, the Universe looks younger, more uniform, and less evolved. Does that mean Earth must be the center?

Think twice before stepping on that crunchy top layer of soil.

Most fundamental constants could be a little larger or smaller, and our Universe would still be similar. But not the mass of the electron.

In the expanding Universe, different ways of measuring its rate give incompatible answers. Nobel Laureate Adam Riess explains what it means.