The surface of the Sun is cooler than its outer atmosphere — the corona heating problem is still unsolved.
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The observable universe is about 93 billion light‑years wide.
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The light you see from some stars today began traveling before humans existed.
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The Moon was formed billions of years ago.
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Interstellar objects have passed through our solar system.
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The light you see from some stars today began traveling before humans existed.
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Venus is sometimes called Earth's sister planet.
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Saturn's rings are made primarily of ice particles and rocky debris.
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The Moon was likely formed after a massive collision with early Earth.
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