[carlos_dfc]

Recommended reading:-
'Bang' - by Patrick Moore, Chris Lintott, and Brian May

In the last chapter it describes the current thoughts on how the Universe will end - and sadly, it will be with a whimper....
There isn't enough matter in the Universe for gravity to slow down the expansion and cause a retraction.
All stars will eventually burn out, some will go with a bang (supernova) with the shockwave causing nearby gas clouds to collapse under gravity and form new stars. But eventually matter will become so spread out, that this will become rarer and rarer, until it stops a;together - the Universe will become a very cold, dark, ever-expanding place - inhabited by only black holes, ever-slowing pulsars, and dead star 'cinders' orbited by cold dead planets.
Time frame for this is well beyond the 5 billion years that our Sun has left, several times as long in fact, the Earth will be long gone by then, and if the Human race is still around, wherever they are will be a very cold, dark place