There are more galaxies in the observable universe than grains of sand on all of Earth's beaches.
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Mercury is the closest planet to the Sun.
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The Moon was formed billions of years ago.
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Magnetars have extremely powerful magnetic fields.
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The Moon's gravity affects ocean tides.
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The Moon is slowly moving away from Earth.
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Neptune appears blue because of methane in its atmosphere.
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The Voyager Golden Record was sent into space containing sounds and images from Earth.
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The Sun occasionally emits powerful solar flares.
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