The Sun accounts for 99.86% of all the mass in the solar system.
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The Earth's gravity keeps the Moon in orbit.
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Mercury is the closest planet to the Sun.
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The observable universe is about 93 billion light‑years wide.
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Neptune has some of the fastest winds in the solar system.
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Black holes have gravitational pulls so strong that not even light can escape.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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There are rogue planets drifting through space with no star at all.
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Supernovae can briefly outshine entire galaxies.
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