Light from the Sun takes about 8 minutes to reach Earth, but took 100,000 years to travel from the Sun's core to its surface.
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The Fermi Paradox questions why extraterrestrial life has not been observed.
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The Apollo 11 mission successfully landed humans on the Moon.
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Cosmic rays constantly bombard Earth from space.
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There are planets made of diamond.
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There are rogue planets drifting through space with no star at all.
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