Category: Did You Know

Tidal interactions with the Moon slow Earth’s spin by about 1.7 milliseconds per century.

The density of matter in a stellar‑mass black hole is so high that a teaspoonful would weigh billions of tons.

Beneath its icy crust, Jupiter’s moon Europa is believed to harbor an ocean twice the volume of all Earth’s oceans combined.

Olympus Mons on Mars rises about 22 km (13.6 mi) high—nearly three times the height of Mount Everest.

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.