There are more possible games of chess than atoms in the observable universe.
Fact #3433
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The Earth's rotation causes the Sun to appear to rise and set.
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The Rosetta mission successfully landed a probe on a comet in 2014.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Mercury is the closest planet to the Sun.
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The telescope expanded understanding of the universe.
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The observable universe is about 93 billion light‑years wide.
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Some stars appear to dim irregularly for reasons that are still studied.
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The Earth's gravity keeps the Moon in orbit.
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