what is the current big bang theory and its implication on the universe?

Answer 1

All models of the universe have the feature that at some time in the past (between 10 and 20 thousand million years ago) the distance between neighbouring galaxies must have been zero. At that time, which we call the big bang, the density of the universe and the curvature of space-time would have been infinite. Because mathematics cannot really handle infinite numbers, this means that the general theory of relativity predicts that there is a point in the universe where the theory itself breaks down. Such a point is an example of what mathematicians call a singularity. In fact, all our theories of science are formulated on the assumption that space-time is smooth and flat, so they break down at the big bang singularity, where the curvature of space-time is infinite. This means that even if there were events before the big bang, one could not use them to determine what would happen afterward, because predictability would break down at the big bang.

Correspondingly, if, as is the case, we know only what has happened since the big bang, we could not determine what happened before-hand. As far as we are concerned, events before the big bang can have no consequences, so they should not form part of a scientific model of the universe. We should therefore cut them out of the model and say that time had a beginning at the big bang.

Many people do not like the idea that time has a beginning, probably because it smacks of divine intervention. (The Catholic Church, on the other hand, seized on the big bang model and in 1951 officially pronounced it to be in accordance with the Bible.) There were therefore a number of attempts in the past to avoid the conclusion that there had been a big bang. Instead they ended up showing that there was a high probability the universe could have had a singularity, a big bang, if the general theory of relativity was correct. Today the big bang theory is widely accepted globally as it is simple and made definite predictions that could be tested by observation.

In addition, we can determine the present rate of expansion of the universe by measuring the velocities at which other galaxies are moving away from us, using the Doppler effect. This can be done very accurately. However, the distances to the the galaxies are not very well known because we can only measure them indirectly. So all we know is that the universe is expanding by between 5% and 10% every thousand million years. The present evidence therefore suggests that the universe will probably expand forever, all we can really be sure of is that even if the universe is going to recollapse, it won't do so for at least another ten thousand million years, since it has already been expanding for at least that long. This should not unduly worry us as by that time, unless we have colonized beyond the Solar system, mankind will long since have died out, extinguished along with our sun.

Answer 2

If measuring the movement of remote galaxies by its red-shift holds, then the Big Bang theory holds too. Because it only projects in the past what we can observe today. And if we look at the future, we can imagine that it will go to the Big Freeze, when distances become so great that particles can't even gather to form atoms.

To make sense, it also means that time and space expand at the same rate as the visible universe. It is not easy to understand when we consider this: Any direction you look at in the sky is where the Big Bang was. Because the further you see in space, the further you see in time.
This is because we see it not in three dimensions but four, time included. Of course, a fourth dimension is difficult for us to understand but if we remove one spacial dimension then we can see the expanding universe as a three-dimensions sphere where all matter is on its surface. As such, and knowing that the sphere (time) expand, we see on the surface galaxies moving from each other. There is no center to it, it expands away from us with time, as the 'sphere' inflates. Cosmic microwave radiation comes from all directions. They are part of the original 'explosion' and after loosing energy with time, only radiations on the microwave frequency remains. This was predicted to happen long before we observed it.

Answer 3

Man is constantly trying to learn all the answers to everything. Since no one was here during the time of the big bang, how can anyone know anything? They have proven that everything is moving away from each other, so the universe is expanding. They trace it backward to look for the starting place. It's just as good an idea as any I've heard.

Answer 4

there are quite a number of theoretical opportunities - you will ought to %. and decide - do slightly examine. One theory is going like this: A quantum fluctuation can ensue in nothingness - it occurs in our universe. The fluctuation that got here approximately in pre-universe nothingness isn't comparable to those we be conscious right here, even though it ought to account for the commencing place of the universe from no longer something in any respect. as quickly because it got here into being, that's accessible that the universe incorporates each and every thing everywhere - there can't be an exterior. however the universe expands - the habit of black holes and the assumption-correct to the "fabrics" of "area-time" means that the universe might improve into time - that's the destiny. In greater convenient words - the universe is fourth dimensional - 3 area dimensions and a million time measurement, yet they do no longer look to be separate - area and time are intermingled into one fact - spacetime. In one among those universe, you could no longer get out - there's no longer exterior - in case you started on a journey as an immortal and traveled in a on the instant line consistently finding for an area or an exterior, you may fail to realize this. Billions of years from now you may return to the factor the place you started your journey in case you do no longer run right into a celeb or something.

Answer 5

The current BB theory is called the Lambda - Cold Dark Matter (LCDM) model. No other cosmological theory can yet explain such a wide range of parameters, from the ratio of the elemental abundances in the early Universe to the structure of the cosmic microwave background, the observed higher abundance of active galactic nuclei in the early Universe and the observed masses of clusters of galaxies. It has only 6 parameters; their current measured values are:

(1) Hubble parameter = 73.2 km s^-1 Mpc^-1
(2) Baryon density = 0.0444
(3) Total matter density (baryons + dark matter) = 0.266
(4) Optical depth to reionization = 0.079
(5) Scalar fluctuation amplitude = 0.813
(6) Scalar spectral index = 0.948

From these values, many other things can be calculated, including the age of the universe (13.73 billion years), and the dark energy density (73.2% of the universe is dark energy).

Some of the important people who developed the LCDM model are Alexander Friedmann, Georges Lemaître, Howard Percy Robertson and Arthur Geoffrey Walker.

Answer 6

Still holds. Albert Einstein predicted it mathematically and observations still indicate an expanding universe. The question is: Were there other big bangs and each produced a universe. So our universe is part of a super universe?

Answer 7

if its expanding because everything shot out from a center point, then the ultimate implication is that the universe will "cool down" and to the point creation stops. like forming galaxies and new stars.

interesting article: http://space.newscientist.com/article/dn8292
it looks like I have the temperature backwards if I'm reading it correctly

Answer 8

It states that, the universe once was a huge ball of fire like the sun... It blew off due to enoromous heat at its center...So many small star dust particles were formed, these formed to galaxies. Solar systems were formed in the galaxies. As the temperature of some particles got reduced, they formed planets and some with high temparature remained stars as it is now. This process goes on and on and on...