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science, tyson, neil degrasse tyson, cosmos, universe, cosmos a personal voyage, cosmos a spacetime odyssey, physics, astrophysics, astronomy, biology, chemistry, math, engineering, celebs, popsci, twitter, tweet, famous scientists, carl sagan, brian cox, bill nye, bill nye the science guy, sas, blunt science, the blunt truth, earth, planet earth
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  • #earth
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