Europa's subsurface ocean is estimated to contain twice as much water as all of Earth's oceans combined.
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The light you see from some stars today began traveling before humans existed.
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The Earth's magnetic field helps prevent atmospheric loss.
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The Earth's orbit around the Sun is slightly elliptical.
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The observable universe is about 93 billion light‑years wide.
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The Earth's atmosphere protects life by filtering harmful radiation.
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Cosmic rays constantly bombard Earth from space.
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Some stars appear to dim irregularly for reasons that are still studied.
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