Most of the universe is empty space.
Fact #3141
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The Milky Way galaxy is part of the Local Group.
Fact #320 · Space
The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
Fact #1600 · Space
The Fermi Paradox questions why extraterrestrial life has not been observed.
Fact #1603 · Space
Some pulsars emit beams of radiation like cosmic lighthouses.
Fact #1610 · Space
Neutron stars can collide and produce heavy elements.
Fact #1627 · Space
The observable universe is about 93 billion light‑years wide.
Fact #1754 · Space
Some exoplanets orbit two stars at once.
Fact #1615 · Space
The heliosphere protects the solar system from interstellar radiation.
Fact #1626 · Space
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