Astrophysics for People in a Hurry (Astrophysics for People in a Hurry Series)

by Neil deGrasse Tyson

the “Planck era” of the early universe. That’s the interval of time from t = 0 up to t = 10‒43 seconds (one ten-million-trillion-trillion-trillionths of a second) after the beginning, and before the universe grew to 10‒35 meters (one hundred billion trillion-trillionths of a meter) across.