Neptune is known for its deep blue color.
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The observable universe spans billions of light-years.
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The Moon was likely formed after a massive collision with early Earth.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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A day on Mercury lasts longer than a year on Mercury.
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Jupiter is the largest planet in the solar system.
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Black holes can slow time so much that seconds near them equal years far away.
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The Moon has no liquid water on its surface today.
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The center of the Milky Way contains a supermassive black hole.
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