While the Big Bang model is well established in cosmology, it is likely to be refined in the future. Little is known about the earliest moments of the universe's history. The Penrose–Hawking singularity theorems require the existence of a singularity at the beginning of cosmic time. However, these theorems assume that general relativity is correct, but general relativity must break down before the universe reaches the Planck temperature, and a correct treatment of quantum gravity may avoid the singularity. COUNT 5
QSN1 The Big Bang model is solidly established in what? ANS1 cosmology QSN2 How much is known about the early states of the universe? ANS2 i QSN3 Which theorems require the existence of a singularity at the beginning of time? ANS3 The Penrose–Hawking singularity theorems QSN4 These theorems have to assume what theory is correct? ANS4 general relativity QSN5 These theorems state that general relatively must break down before what? ANS5 before the universe reaches the Planck temperature