• Simple definition: a scientific theory which proposes that the Universe has not always been as it is now, that it originated (formed) from an "atom" or "singularity" at some point in time in the past, and that the Universe has been expanding since its origin.
  • This theory was born of the observation that other galaxies are moving away from our own at great speed in all directions, as if they had all been propelled by an ancient explosive force.

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