The asteroid belt between Mars and Jupiter contains millions of asteroids but is mostly empty space.

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

Fact #1782 · Space

Mercury has extreme temperature differences.

Fact #147 · Space

There are rogue planets drifting through space with no star at all.

Fact #1781 · Space

Solar eclipses occur when the Moon blocks the Sun from Earth's view.

Fact #189 · Space

Project Mercury was the first U.S. human spaceflight program.

Fact #1074 · Space

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

Fact #1793 · Space

Venus is sometimes called Earth's sister planet.

Fact #309 · Space

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

Fact #1835 · Space