Black holes can slow time so much that seconds near them equal years far away.
Fact #2096
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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The light you see from some stars today began traveling before humans existed.
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Some exoplanets orbit two stars at once.
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The Sun occasionally emits powerful solar flares.
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The expansion of the universe was first observed in the 1920s.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Moon completes its phases in about 29.5 days.
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In 1977, a mysterious signal known as the 'Wow! signal' was detected from space.
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