Not if the Universe actually curves back around onto itself.

I believe it depends on how powerful the Big Bang was, and whether gravity is enough to pull the universe back together.

This is a question that has puzzled astronomers since we accepted the idea that the universe is expanding. As of 1998, the astronomical community thinks that we have an answer to this question. It appears that the universe will expand forever. The strange thing about the answer is that the rate of expansion actually seems to be increasing rather than decreasing. Gravity should be slowing the rate of expansion. However, there seems to be another force (dubbed dark energy) that is working in opposition to gravity to speed up the expansion. Just what this dark energy is and where it comes from is still a mystery. This is currently one of the big areas of research in cosmology.

This is a very interesting question, and one on which I believe scientists are still divided. The universe is certainly still expanding, but no-one seems sure whether this will continue ad infinitum or whether it will all start to come back in eventually, causing a Big Crunch.

I watched a program recently about space and it's many wonders. According to the scientists in this program, the universe will not collapse back in on it's self, but will remain in a constant state of expansion for all relative eternity until it dissapates into nothingness. If this hypothesis is correct, it will take aeons of billions of millenia to accomplish this dispersement. We however, will be long since extinct, and this forecast is very accurate as our Milky Way galaxy, is on a collision course with the galaxy of Andromeda. This event will be catoclismic and end much of all life in the universe as these two galaxy's mesh to form a new and larger galaxy. This event has been forcasted to happen sometime in the next 4 or 6 billion years. But by 4 billion years our sun will form into a red giant, and consume the planet, making all life and man, virtually extinct.

If it was possibel, and we could turn time backwards, we would, obviously see that the universe would contract, rather than expand. From this we may know that it is in fact the introduction of 'time' that caused the expansion of universe, beginning with 'the big bang'. Time is expanding from the centre of all physical matter, which accelerating expansion is the cause of gravity. And since we can see that the expansion of time in all directions equals the expansion of space in all direction, it makes sense to say that time and space are, if not two names to the same phenomenon, so at least it is directly correllated to each other. So, time/space is the repelling factor, which seemingly contradictingly also causes the gravitational forces. Stop time, and gravity would cease. It is very much like the accekleration of a car; When a car accelerates, you are pressed back into the seat. The acceleration is the very requirement of the force that presses you back into the seat. One might, then, think that this force that presses me back into the seat would cause me to go backward towards the point of origin, but this will not happen since the force is in fact coexisting with the gravitation. So it is with gravity and the accelerated expansion of the universe. Time/space acceleration causes the gravitational forces. Since time/space expands from the center of every physical particle, all particles recieves a force-field of gravitation, which only affects particles within its sphere of gravitational reach. Particles so attracted to each other give cause to an united gravitational force. But it could never attract everything, since at the same time as gravity would pull stronger than time/space expansion, the acceleration that causes gravitation would cease, and expansion would continue.