The matter in the very early universe was flying apart for unknown reasons (most likely as a result of cosmic inflation) and has simply continued to do so, though at an ever-decreasing rate due to the attractive effect of gravity.
Mateeria varajases universumi eemaldus üksteisest mitte teadaolevatel põhjustel (kõige tõenäolisemalt kosmilise inflatsiooni tagajärjel) ning on lihtsalt jätkanud seda, kuigi pidevalt aeglustudes gravitatsiooni kokkutõmbava mõju pärast.