Pulsars emit radiation beams from their magnetic poles — if those beams sweep Earth, they appear to pulse.

The Moon completes an orbit around Earth in about 27 days.

Fact #225 · Space

There are black holes at galaxy centers.

Fact #1714 · Space

The Hubble Space Telescope has captured deep images of distant galaxies.

Fact #61 · Space

Saturn's rings are made primarily of ice particles and rocky debris.

Fact #17 · Space

Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.

Fact #1782 · Space

The Sun will eventually expand into a red giant.

Fact #111 · Space

The light you see from some stars today began traveling before humans existed.

Fact #1726 · Space

There are more stars in the universe than grains of sand on Earth.

Fact #1680 · Space