At present we can look at all the galaxies as mathematical points moving away from each other. But if you run the equation backwards then at some point the description of galaxies as simple points stop making sense.
There is a lot of stuff in the universe.
When you bring all that stuff very close together how will it behave?
You assume that you can just keep going backwards treating galaxies as points, but those "points" are made up of a lot of stuff so that when they come close together they probably don't behave as points anymore.
And at some point things are so close together that a lot of quantum effects become important.
There is no reason to think it will shrink into an infinitly dense point.
Take your ballon example.
It is true that when you let out the air it shrinks, but it doesn't shrink to a point. it shrinks to a limp peace of plastic.
I have to say here, we have pictures of the universe before any galaxies existed at all. The galaxies are of course made up of stars and gas and dust.
We know the first starts starting forming around 200 million years after the bang.
"There is no reason to think it will shrink into an infinitly dense point."
actually there is
"When you bring all that stuff very close together how will it behave?"
a singularity, although different then a black hole singularity.
"
Take your ballon example.
It is true that when you let out the air it shrinks, but it doesn't shrink to a point. it shrinks to a limp peace of plastic"
This is not a good analogy.
If you go back as far as you can in planck time, you get all four fundemental forces combined.
"There was no carbon, when the universe began in the Big Bang, about 15 billion years ago. It was so hot, that all the matter would have been in the form of particles, called protons and neutrons. There would initially have been equal numbers of protons and neutrons. However, as the universe expanded, it would have cooled. About a minute after the Big Bang, the temperature would have fallen to about a billion degrees, about a hundred times the temperature in the Sun. At this temperature, the neutrons will start to decay into more protons. If this had been all that happened, all the matter in the universe would have ended up as the simplest element, hydrogen, whose nucleus consists of a single proton. However, some of the neutrons collided with protons, and stuck together to form the next simplest element, helium, whose nucleus consists of two protons and two neutrons. But no heavier elements, like carbon or oxygen, would have been formed in the early universe. It is difficult to imagine that one could build a living system, out of just hydrogen and helium, and anyway the early universe was still far too hot for atoms to combine into molecules.
The universe would have continued to expand, and cool. But some regions would have had slightly higher densities than others. The gravitational attraction of the extra matter in those regions, would slow down their expansion, and eventually stop it. Instead, they would collapse to form galaxies and stars, starting from about two billion years after the Big Bang. Some of the early stars would have been more massive than our Sun. They would have been hotter than the Sun, and would have burnt the original hydrogen and helium, into heavier elements, such as carbon, oxygen, and iron. This could have taken only a few hundred million years. After that, some of the stars would have exploded as supernovas, and scattered the heavy elements back into space, to form the raw material for later generations of stars."
Life in the Universe
lunakilo, are you aware of the Cosmic Background Radation and what it actually is and tells us?
Wilkinson Microwave Anisotropy Probe (WMAP)