There are more possible iterations of a game of chess than there are atoms in the known universe.
Fact #3471
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Some galaxies are trillions of miles wide.
Fact #1713 · Space
Black holes can slow time so much that seconds near them equal years far away.
Fact #1790 · Space
In the 1960s, Project Orion explored the possibility of nuclear-powered spacecraft.
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Neptune is known for its deep blue color.
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Some birds migrate using landmarks and stars.
Fact #477 · Space
Space is completely silent.
Fact #1689 · Space
The Sun accounts for more than 99% of the mass of our solar system.
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Black holes form from collapsed massive stars.
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