Hey I'm new here and still in high school but incredibly interested in physics and philosophy...

I had an idea about how the universe has formed: What if before the Big Bang happened there was a universe very similar to the one we live in now. The universe is in a constant cycle of collapsing on itself and re"big banging". Right now it is still in the process of expanding but what if in 129038471234 years there become more and more black holes and these combine into another extremely dense mass and blow up again in a Big Bang?

I'm sorry if this is worded badly, ask if you do not know what I am trying to say and remember I'm in high school, cut me some slack ;)

The first sentance is totally possible. But you cannot define two universes together as a reference point to time passing.

The cyclic universe is well established for the second point.

Why such a specific number of 129038471234 years ? Why not in a million, million, milliom, million, million years?

But most of all, what is meant by blow up the universe?

If gravity becomes to strong for the fabric of spacetime, it was collapse back on itself, and shove spacetime backwards. THERE WILL BE no initial bang, just because gravity has became stronger. Everything needs to return back to the gravitational singularity where everything came from.

Right now it is still in the process of expanding but what if in 129038471234 years there become more and more black holes and these combine into another extremely dense mass and blow up again in a Big Bang?

Well, at the current rate of expansion, in roughly 60 billion years there won't BE anything around in the universe. It will have expanded so much that space is effectively a vacuum.

Yeah, most present theories suggest the universe is going to keep expanding, faster and faster (due to the presence of dark energy), until space itself has been stretched to the point that everything gets ripped apart atom by atom. They call it the "Big Rip". The cyclic universe model doesn't match current observations, because the universe's rate of expansion is increasing, not decreasing.

@ Reiku
That number wasn't supposed to be specific, I just meant to say in a long time haha. And what I meant by blow up is have another "Big Bang" occur

@ BenTheMan & CptBork
Thanks for the insight, what happens after the "Big Rip" though? Is the universe split into smaller ones with less matter in each?

@ BenTheMan & CptBork
Thanks for the insight, what happens after the "Big Rip" though? Is the universe split into smaller ones with less matter in each?

At that point, if present physics and the Big Rip model holds, all points in the universe would lose causal contact with each other. You couldn't see light or any kind of signal being emitted from anywhere- in effect, every particle in the universe will come to "think" that it's the only thing in existence. Before that happens though, from what I hear, it may be possible for isolated solar systems to form billions of years from now, moving away from everything else faster than light but not themselves tearing apart. So if our species could stick around long enough, eventually all evidence of the Big Bang would cease to be visible, and we'd have no way of knowing how old the universe is or if it even has an age.

Thanks a lot of the answers, that opens my horizons a little... =)

Well, at the current rate of expansion, in roughly 60 billion years there won't BE anything around in the universe. It will have expanded so much that space is effectively a vacuum.

Let me expand on this notion, in pregressive times.

In 10^14 years, the longest lived low mass stars will have collapsed due to thermonuclear runnaway.

After 10^15 years, the sun may collide with another star from andromeda which is moving closer to us at (if my memory serves me correctly), at something like 300,000 miles per sec.

after 10^19 years, the center region of our galaxy, will possibly collapse into a black hole

In 10^20 years, our solar system will decay through gravitational radiation

In 10^64 years, most black holes of solar mass will have decayed through electroradiation processes

And, in 10^1500, all matter and energy in the universe will have fissioned or fusioned together turning them chemically into iron, through these radiactive processes.

In 10^1500 Gyears the observable universe may contain just one single photon.
But long before that `time`, i suspect that the notion of `space` and `time` has becomes meaningless.