A solar flare can release the equivalent energy of billions of nuclear bombs in minutes.
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Mercury has no substantial atmosphere to trap heat.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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The Earth's gravity keeps the atmosphere in place.
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The Rosetta mission successfully landed a probe on a comet in 2014.
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The Earth's orbit around the Sun is slightly elliptical.
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The International Space Station travels at about 28,000 kilometers per hour.
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The Moon was formed billions of years ago.
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Cosmic rays constantly bombard Earth from space.
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