Contracting universe?

The question seems to be about 'arrowsof time' rather than whether the universe will eventually contract.

There are three natural arrows of time: 1) the direction in which the universe expands. 2) The direction of entropy increase. 3) The opposite of the direction we remember (we remember the past, not the future).

If the universe were to start contracting, the first one reverses direction. There is a natural question whether the other two also change direction. Now, there are good arguments to say that the direction of entropy increase and the direction opposite of memory have to be the same. So the question really boils down to whether entropy will start decreasing if the universe starts to contract.

This is really not so unreasonable of a possibility since, one might think, the end of the 'Crunch' seems to be much more ordered than the 'expanded state'. So, many people thought that 'time would run backwards' during a contraction. More detailed computations have shown this to be wrong, but this is what was meant by those saying this.

Of course, the fact that the expansion is accelerating and will almost certainly continue to do so, says that there will not be a contraction phase. So the whole discussion isn't relevant to the real world according to what we know.

I used to buy into the theory that the universe would one day contract and do the "Big Crunch", but not anymore. If the Galaxies are not only moving away from each other, they are doing so at higher rates, that means acceleration. For acceleration to take place, there must be some force, unknow/unseen, that is causing that acceleration. Unless that force stops, for whatever reason, the Universe will continue to expand.

Because they have no common sense.

They are probably the same people who walk backward to the office when they are late and are thinking that behind their mirror hides a parralel universe .

It won;t. There is dark amtter that is causing the rate of explansion to increase.

The idea of it reatching critical volume and expanding has been rejected.

Altough this may well change!

I don't know, Time is a man made thing really. Things would just be going in a different direction that's all!

the expansion and contraction of the universe should not affect the dimension of time.

Time is merely energy changing.

time is manmade

thats not a question dude!!