Civilizations and the quest of nirvana

The idea of heaven and hell is pretty much embedded in outlook of social life and has been accepted since time immemorial. I have summarized them civilization wise as below:

Mesopotamian / Sumer civilization (4500 BC):

Mesopotamians believed in netherworld which is equivalent to hell. It was a dark place with no return. However, there were no punishments or torture. It was supposed to be just a place that is dull and mundane. There was no concept of heaven as well. Everyone who dies and have proper burial / funeral will be transported to netherworld. There will be 7 gates to the netherworld and the dead will transition after judgement from court of the Annunaki.

Genesis of Life

After earth was formed, it was too hot to host any form of life. It cooled off over millions of years.

The gas clouds consisting of hydrogen and water vapor began to settle.