at the beginning of the universe, stars were so dense that the atoms in the center compounded together to make new denser elements like oxygen. helium and oxygen combined into water. and eventually, the stars collapsed and exploded into a supernova, and the water was sent flying to earth.

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In the early universe, stars were immensely dense, causing atoms at their cores to fuse, creating new elements like oxygen. Helium and oxygen then combined, forming water molecules. Eventually, these stars collapsed and exploded in supernovas, scattering the water throughout space. Over time, some of this water reached Earth.