"The last 3 minutes" by Paul Davies[1] is a good popsci read on this topic.

[1] https://www.amazon.com/Last-Three-Minutes-Conjectures-Ultima...

For a hopeful infinite and eternal, see the book: The Last Three Minutes: Conjectures About The Ultimate Fate Of The Universe, http://www.amazon.com/dp/0465038514,

Some free excerpt: http://www.questia.com/library/98211062/the-last-three-minut...