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ARC-Easy / Mercury_7042543 / Astronomers have found low-energy background radiation in every part of the sky…

Problem

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question

Astronomers have found low-energy background radiation in every part of the sky that they have studied. This radiation is taken as evidence of energy remaining from which event?

choices

  • supernovas
  • the big bang
  • collisions of galaxies
  • modern decay of unstable atoms

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Source and history

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