At the very instant of the Big Bang, 13.7 billion years ago, the universe is thought to have had infinite temperature, as it existed as a single, infinitely-small and infinitely-dense point. Just 10**-43 seconds later, known as the Planck time, the universe had cooled to roughly 10**32K, and expanded to a size of around 10**-33cm across.

NB -43 43 and -33 here are all superscript