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They get so hot that the nuclei of the atoms, fuse together deep within them to make the oxygen we breathe. The carbon in our muscles, the calcium in our bones, the iron in our blood, all was cooked in the fiery hearts of long vanished stars.

(Source: alwaysmoneyinthebnanastand)

— 1 day ago with 14957 notes
#neil degrasse tyson  #science  #cosmos  #a spacetime odyssey 

nun-final:

Some claim that evolution is just a theory, as if it were merely an opinion.

— 1 day ago with 8823 notes
#neil degrasse tyson  #evolution  #science  #cosmos  #a spacetime odyssey