ultimate fate of the universe; end of the universe
Astronomical term referring to the final state or destiny of the universe, including scenarios like heat death, Big Crunch, or Big Rip.
There are several theories about the ultimate fate of the universe.
This book explains the end of the universe in an easy-to-understand way.
Compound of 宇宙 (uchū, 'universe') + の (no, possessive particle) + 終焉 (shūen, 'demise, end'). The term is a straightforward descriptive phrase used in astronomy.