Category: Did You Know

Interstellar space contains about one atom per cubic centimeter, meaning there’s still sparse matter between stars.

Saturn is the only planet in our solar system that's less dense than water. If you could find a bathtub big enough, Saturn would float in it!

Launched in 1977, Voyager 1 crossed into interstellar space in 2012 and continues to communicate with Earth.

Sunsets on Mars appear blue to the human eye because its thin atmosphere scatters sunlight differently, favoring the blue part of the spectrum.

Our galaxy is on a collision course with Andromeda and will merge in roughly 4.5 billion years.

Unlike most planets, Venus rotates in the opposite direction of its orbit, so the Sun would rise in the west and set in the east.

Tombaugh Regio, a vast nitrogen‑ice plain on Pluto, forms a distinctive heart shape visible in New Horizons images.

A sugar‑cube‑sized amount of neutron star material would weigh about a billion tons on Earth.

The faint afterglow of the Big Bang, the CMB, provides a snapshot of the infant universe about 380,000 years after its birth.

Each year, the Moon drifts about 3.8 centimeters farther from Earth, gradually lengthening our days over millions of years.