A sea star moves using tiny tube feet.
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Neptune is the farthest known major planet from the Sun.
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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 observable universe is about 93 billion light‑years wide.
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There are more trees than stars in our galaxy.
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Black holes can slow time so much that seconds near them equal years far away.
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Gravitational waves were detected a century after Einstein predicted them.
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Saturn's largest moon is Titan.
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The Sun accounts for more than 99% of the mass of our solar system.
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