Does universe expand for ever or will it have a big crunch?

For now, all the observations indicate that its going to expand forever.

For now, all the observations indicate that its going to expand forever.

 

So if it will expand forever and is accelerating, will the universe once expand faster than light?

The observations show that the expansion is already faster than the speed of light.

 

We don't really know enough about the acceleration mechanism to state with any certainly about s big crunch or not.

According to a rather exotic theory, time may simply stop in five billion years:

 

http://news.nationalgeographic.com/news/2010/10/101027-science-space-universe-end-of-time-multiverse-inflation/

Not everything will end up getting sucked into a single point as while matters try to crunch into the Big Crunch, they always explode and interact with others and some will manage to forever not get caught up by the gravity of Big Crunch. it's like this, this atom gains whatever force, and starts to move at 3 mm per second toward west. Big Crunch is far away from that atom on the East, its currenty gravity on that atom is 0.000000033mm per second. As the atom goes further and further, the gravitational pull becomes less and less, which will never catch up to the 3mm per second velocity. So that atom escapes eternally from that Big Crunch unless something else happens.

 

The universe one day will get really inhabitable as I foresee matters get colder and colder. More and more metals start to appear, but that's on a huge scale though, billions of years scale.