The light you see from some stars today began traveling before humans existed.
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The observable universe is about 93 billion light‑years wide.
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The Milky Way galaxy contains billions of stars.
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The Vostok 1 mission marked the first human spaceflight.
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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 an orbit around Earth in about 27 days.
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Saturn's largest moon is Titan.
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The observable universe is about 93 billion light‑years wide.
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There are rogue planets drifting through space with no star at all.
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