Some stars appear to dim irregularly for reasons that are still studied.
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Black holes can slow time so much that seconds near them equal years far away.
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The International Space Station orbits Earth every 90 minutes.
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Some stars explode when they die.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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Black holes can slow time so much that seconds near them equal years far away.
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Saturn's largest moon is Titan.
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The Moon has no liquid water on its surface today.
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