The Space Race led to the Apollo 11 Moon landing in 1969.

Dark matter is believed to make up most of the universe’s mass but has not been directly observed.

Fact #1594 · Space

There are planets made of diamond.

Fact #1688 · Space

Mercury has no substantial atmosphere to trap heat.

Fact #249 · Space

Time moves slower in stronger gravitational fields.

Fact #1794 · Space

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

Fact #1897 · Space

The U.S. government ran Project Stargate to study alleged psychic phenomena.

Fact #1065 · Space

Black holes can slow time so much that seconds near them equal years far away.

Fact #1810 · Space

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

Fact #1731 · Space