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- BIG BANG
-
- A generally accepted model for the formation of the universe. According to it, the universe was originally in an
- infinitesimally small and dense state, a state where density and curvature are close to infinity (zero in volume and
- infinite in temperature). Entropy in the universe was zero and the concept of time was not yet valid. Such a state of
- singularity widened very fast (generally verb 'explode' is used) producing particles and antiparticles.
- After the beginning, spacetime has been continuously expanding and cooling down, and its entropy has been
- increasing.
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- The big bang is often described as an expanding bubble, as shown in this figure. However, this is incorrect in the sense
- that the universe cannot be seen from outside, because time and matter, as well as any observer, are all inside the
- explosion, even if the size of the universe is infinitesimally small.
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