The Sun accounts for more than 99% of the mass of our solar system.
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A teaspoon of neutron star material would weigh billions of tons.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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The Vostok 1 mission marked the first human spaceflight.
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There are rogue planets drifting through space with no star at all.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Black holes can slow time so much that seconds near them equal years far away.
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The Mars Pathfinder mission tested new landing techniques.
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The International Space Station orbits Earth every 90 minutes.
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