Eschatology
See also: End timeEschatological scenarios may include a new different world after the end time of the current one. For example, Hindu cosmology includes the idea of an infinite cycle of births and deaths and an infinite number of universes with each cycle lasting 8.4 billion years.
One such half-cycle of existence of Universe is of 4.32 billion years according to Surya Siddhanta; which is equal to one day in the life of Lord Brahmaa, followed with night of Lord Brahmaa of same length. Entire life span of Lord Brahmaa is of 36000 such cycles, accumulating to 311040 billion years, half of which has already elapsed. This view is exactly replicated in the Creation ("Sarga") chapters of all major Purana, e.g., Brahmaanda Purana. Last verse of 12th chapter in Surya Siddhanta also gives the size of our universe ("brahmaanda") being equal to 18,712,080,864,000,000 yojanas, which is equivalent to 15769 light years or 1.5 * 10^17 km since 800 Surya Siddhantic yojanaa are equal to Earth's radius (verse- 59 in chapter-i). The very word "brahmaanda" for universe means "Egg of Brahmaa", hence the Hindu concept of Universe visualized it to be egg-shaped.
Similar eschatological scenarios appear in other religions, in the form of belief in there being a new and different world after the end time of the current one.
Read more about this topic: Multiverse (religion)