Please explain why there is no center to the universe?

Just to play devil's advocate for a second, it is just as likely that there IS a center to the universe as there isn't, if not MORE likely.

The theory of infinite space is just that, a theory. Likewise, by definition, the "universe" is defined by mass, so infinite space shouldn't even factor into the question or answer.

While the universe can not have a center based on theories contained within quantum mechanics and string theory, when you OBSERVE how things actually work, the theory that the universe has a center is MUCH more likely in accordance with the big bang theory.

Here's what we KNOW:

Moons orbit planets due to gravity.

Planets rotate around stars due to gravity.

Stars rotate around other stars due to gravity.

Logically, it is easy to conclude that this trend could continue. In that case, solar systems would orbit a galatic center comprised of a massive black hole. Galaxies would then orbit an even larger local center comprised of an even more massive black hole. This would go on and on until eventually the last common denominator is that all galaxy super-sets would be orbiting around a universal center comprised of the universe's most massive object, which is inevitably just the universe's most massive black hole.

Ignoring other theories, it is pretty simple and plausable to predict that following the big bang, the majority of mass in the universe would still concentrate in the center, while all other mass would accelerate outwards in a statistical sphere (randomly, but spherical on the average) around this center. As the galaxies and solar systems formed, their mass would inevitably, and at the lowest common denominator, orbit around this universal center of mass.

Remember, that when you are talking about questions like "is there a center to the universe," the answers are not absolute. Each and every answer to this question and countless others in science are just theories, and the ones with the most evidence and support are sometimes treated as fact although they are really just educated guesses.

In this case, the arguement for there being a universal center as just as "true" as the arguements that there is not.

The universe is a finite entity one day it will come to an end.

The universe expands spherically and it has or had a center.

We know the origin lies some where in the past.

To extrapolate backward to the origin may not be possible.

All galaxies appear to be moving away from each other at an accelerated rate,but this just can't be.

The farthest galaxies that we see don't exist anymore.

A galaxy may be an end stage in an evolving universe and the red shift we see may be an artifact of an evolving galaxy.

This would produce a red shift no matter what side you viewed it from,so trying to find the origin or center may not be possible.

Layman's terms huh?

When we look out into the Universe at other galaxies, everything appears to be moving away from us. At the same when we compare the galaxies relative to each other, they appear to be moving away from each other as well. The conclusion made is that the Universe is in expansion. Because there is no edge of the Universe, and it's infinitely expanding in every direction, the center cannot be known, and thereby no longer exists.

In simpler terms. To find the center of an object, there has to be an edge from which you can calculate it. In the case of the Universe, it is constantly expanding, which means there is no edge, which means there is no center.

First take into account that no matter where you are in the universe, whatever galaxy you are referencing from, that every other galaxy appears to be moving away from you. This is a matter of perspective.

To illustrate this take a balloon and mark several points on the surface, focus on one of these points and blow up the balloon. Your point, as long as you stay focused, doesn't appear to move at all while all the other points expand away from it. Choose another point and repeat, again your point appears to be the center while all other points expand away. Your point is no more special than any other point.

Furthering this example, all points on your balloon are expanding away from each other in every direction, so now take the universe to be the SURFACE of the balloon. Draw a line to another point and pass through the center of the surface. You can't because on a sphere there is no center.

This is one theory, believe what you will.

The issue is not so much whether the universe has a centre but whether the concept centre has any meaning for the universe.

When you say "centre" you are implying a lot of things you take for granted - that space time is flat and static, that it has edges or that the thing you want to find the centre of has edges in that space time and that from those edges and the distribution of material within them you can arrive at some way of defining what centre means.

So finding the centre of a ball is easy - its a sphere and you can geometrically locate it, and its centre of mass is in the same place. But where is the centre of a country? You know its boundary, but its an odd shape, and what is inside it is not smooth or flat. There are mountains (bumps), lakes (holes) etc. And do you want the geographical centre? The population centre? The centre of mass? They will all be different.

Now think of the centre of a cloud. It has all those problems, and its boundaries are moving.

In fact most of the notions of centre break down for the universe, including the notion that space time itself is flat.

However Large The Universe Is, You Would Think That It Has To Have A Centre, Even If Its Location Is Always Moving

you are still thinking that the big bang was a localized explosion, like dynamite going off, but it wasn't. everything was in there, there is no center to the big bang. from our point of view we are at the center, but if we were in some galaxy millions or billions of light years away we would see the same thing and subsequently say that we are at the center of the universe.

do you get it? there is no center to the universe. it can be hard to grasp, but just remember that the big bang was not an explosion in space it was an explosion of space.

Everywhere you ever go in the universe is the "center" becouse no matter where you are there is an infanite about of space in every direction. So that mean and everwhere is the "center" but there is no proper centre.

its maybe becouse the unverse is ssourounded with many system which takes on differnet shapes.Basing on the fact of the earth, its a sphere and being on the outer space let me call it the circumference, there's no centre only when u use the diameter will u be able to get to the epi-centre and hwen u are out you dont see the centre .

Imagine a 2-dimensional world living on the surface of a giant ball. Their universe curves round on itself, and there is no center. (The center of the ball does not count, since they are living on the surface of the ball, the center of the ball inside is not part of their universe.)

Many scientists believe our 3-dimensional universe is like the surface of a hypersphere. We also have no center because our universe curves around on itself and there are no edges.