Board Thread:Lore Discussion/@comment-37034290-20181120100645/@comment-9212235-20181211081646

You heard wrong. There isn't a "billions of years" in TES.

Alduin brings about new kalpas, as linked above, which are cycles of the universe. These are not new universes, but instead are cycles of the mortal world.

Anu, the Dreamer/Godhead/Amaranth of this universe, existed in some pre-universe, likely with its own Dreamer/Godhead/Amaranth since the concept behind TES is cycles upon cycles and circles within circles. While several places discuss this, the most direct explenation of the birth of Anu's Dream is from the Annotated Anuad, which is the Bosmer creation myth. The bit where Anu sleeps in the sun is where the new universe, the Aurbis, Anu's Dream, begins.