Some pulsars emit beams of radiation like cosmic lighthouses.
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The Moon was formed billions of years ago.
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The light you see from some stars today began traveling before humans existed.
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The Moon has no liquid water on its surface today.
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Project Blue Book investigated reports of unidentified flying objects.
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The light you see from some stars today began traveling before humans existed.
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Black holes have gravitational pulls so strong that not even light can escape.
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