史蒂芬·霍金於1999年寫道:「So what the singularity theorems are really telling us, is that the universe had a quantum origin, and that we need a theory of quantum cosmology, if we are to predict the present state of the universe.」存档副本. [2015-02-14]. (原始内容存档于2015-02-14).
史蒂芬·霍金於1999年寫道:「So what the singularity theorems are really telling us, is that the universe had a quantum origin, and that we need a theory of quantum cosmology, if we are to predict the present state of the universe.」存档副本. [2015-02-14]. (原始内容存档于2015-02-14).