BOUNDLESS EXPANSE 3D

Cosmic String

HYPOTHETICAL · a crack in spacetime
Cosmic String
AI illustration of the real object
WIDTH thinner than a protonMASS mountains per millimeter

Some theories of the early universe predict leftover defects: threads thinner than a proton but so dense that a kilometer would outweigh the Earth, stretched across the cosmos like cracks in cooling ice. A cosmic string would betray itself by splitting the images of galaxies behind it into identical pairs. Astronomers have looked. The universe, so far, appears uncracked.

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