An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

The first 10^-43 seconds of the Universe's existence, when the size of the Universe was roughly the Planck length and during which quantum effects of gravity were significant. Also called Planck epoch. Our understanding of the Planck era is poor because theory which encompasses both quantum mechanics and general relativity is needed to be developed.

→ Planck; → era.