The Earth's atmosphere gradually thins into outer space.
Fact #163
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The Moon was likely formed after a massive collision with early Earth.
Fact #209 · Space
The Fermi Paradox questions why extraterrestrial life has not been observed.
Fact #1603 · Space
Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
Fact #1848 · Space
A day on Mercury lasts longer than a year on Mercury.
Fact #102 · Space
The Moon's surface is covered with regolith, a layer of loose rock and dust.
Fact #241 · Space
The Moon has no liquid water on its surface today.
Fact #324 · Space
The light you see from some stars today began traveling before humans existed.
Fact #1761 · Space
A day on Venus is longer than its year.
Fact #1684 · Space
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