The Fermi Paradox questions why extraterrestrial life has not been observed.
Fact #1603
More Space Facts
Neptune appears blue because of methane in its atmosphere.
Fact #167 · Space
Venus has the longest day of any planet in the solar system.
Fact #263 · Space
A day on Mercury lasts longer than a year on Mercury.
Fact #102 · Space
The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
Fact #1593 · Space
The Earth's rotation causes day and night cycles.
Fact #185 · Space
There are rogue planets drifting through space with no star at all.
Fact #1897 · Space
Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
Fact #1735 · Space
Project Blue Book investigated reports of unidentified flying objects.
Fact #1047 · Space
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