Saturn's rings are made mostly of ice and rock.
Fact #2455
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Some stars appear to dim irregularly for reasons that are still studied.
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The Earth's axis is tilted about 23.5 degrees.
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Neptune is known for its deep blue color.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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The Moon slowly moves away from Earth by a few centimeters each year.
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Black holes can merge and release enormous energy.
Fact #1614 · Space
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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