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If the expansion of the universe was reversed it would shrink to a point in about?
Wiki User
∙ 14y ago
If the contraction occurred at the same rate as the expansion has, then it would take about fifteen billion years.
Wiki User
∙ 14y ago
Anonymous
5 years
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What evidence is there that a big bang took place?
Both the background level of microwaves and the continuing outwards expansion of the universe can be theoretically reversed to indicate a starting point in time and space from which all the universe began.
The mysterious force that may be causing the expansion of the universe to accelerate is called?
The current state of affairs with regard to the expansion of the universe point to dark energy as the cause of the expansion of the universe. It is not a force though.
What name do you give to the theory for the origin of the Universe?
The Big Bang Theory is the name given to the theory of cosmic expansion. The idea is of an ever expanding universe. It posits that at some point all matter in the universe was contained within one point.
How do you work out the age of the universe?
The age of the Universe is calculated based on several methods; one that is fairly easy to understand is the expansion of the Universe. If you extrapolate the expansive movement of the galaxies into the past, you get to a point where they were very close together. The time when this should have happened gives you a general idea of the age of the Universe - assuming that the speed of expansion didn't change. (This assumption isn't entirely accurate, though.)The age of the Universe is calculated based on several methods; one that is fairly easy to understand is the expansion of the Universe. If you extrapolate the expansive movement of the galaxies into the past, you get to a point where they were very close together. The time when this should have happened gives you a general idea of the age of the Universe - assuming that the speed of expansion didn't change. (This assumption isn't entirely accurate, though.)The age of the Universe is calculated based on several methods; one that is fairly easy to understand is the expansion of the Universe. If you extrapolate the expansive movement of the galaxies into the past, you get to a point where they were very close together. The time when this should have happened gives you a general idea of the age of the Universe - assuming that the speed of expansion didn't change. (This assumption isn't entirely accurate, though.)The age of the Universe is calculated based on several methods; one that is fairly easy to understand is the expansion of the Universe. If you extrapolate the expansive movement of the galaxies into the past, you get to a point where they were very close together. The time when this should have happened gives you a general idea of the age of the Universe - assuming that the speed of expansion didn't change. (This assumption isn't entirely accurate, though.)
When will the sun stop glowing?
In 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 Ad _____________________________ That's a matter of some debate. Sun-sized stars never completely die; they shrink into white dwarf stars, and continue to shine. Depending on the ultimate fate of the universe, they may shine, more and more dimly, essentially forever. Some theories of the universe, however, speculate that at some point universal gravitational attraction will slow down the expansion of the universe and cause it to collapse back down to a point.
How do cycloids relate to the Big Bang Theory?
In both matter dominated and radiation dominated closed Universes, the evolution is cycloidal; i.e. the scale factor grows at an ever-decreasing rate until it reaches a point at which the expansion is halted and reversed. The Universe then starts to compress and it finally collapses in the Big Crunch.
Why do people believe the big bang theory?
Because that is what our standard model of the universe tells us. It is due to the red shift of light showing that our universe is expanding away from a point. Now since we know time moves in a linear fashion, it is not hard to imagine that if we reverse this expansion, the whole universe is brought back to a tiny point commonly known as the "singularity". The real question is "how?" or "why?" this expansion happened.
What is oscilating universe theory?
This refers to the idea that after a period of expansion, the Universe will eventually contract again (due to attractive gravitational forces), return to a tiny point, and explode again in another Big Bang. This no longer seems likely to happen, since it has been found that the expansion of the Universe is actuall accelerating, not slowing down.
Why can't we point to an area in space and say That is where the big bang occurred if it indeed occurred in one fixed point in space?
The reason is simple: the Big Bang did NOT occur in one fixed point in space. Contrary to popular presentations, the initial expansion (NOT an explosion) of our Universe was not matter filling empty space, going from an area of high density outside to an area of low density. It was an expansion of space itself, not going "into" anything. Matter was simply taken along for the ride. Every point in our Universe has had the same level of expansion as every other point.
Is an instant rapid and hot expansion of the universe the same thing as an explosion?
No. An explosion is an expansion of matter from a central point of high density to outer points of lower density. This is NOT what happened during the Big Bang, despite numerous popular presentations to that effect. The Big Bang was NOT an expansion of dense matter from a central point into empty space. It was an expansion of space itself.
If gravity dominates the expansion of the universe what would happen to the universe?
It would begin to collapse inwards towards its most massive points until finally it all met at one point, according to some theories.
Where was that point from which the universe was made and the big bang was taken place?
Contrary to the popular mis-representations of the Big Bang as an explosion of matter into empty space, there is NO POINT from which the BB occurred. Instead, it was an expansion of space itself, at every point in the Universe. The best CORRECT representation of the BB I have used is that of a surface of a sphere, constantly expanding its radius. Imagine, if you will, a balloon filling up with air. Note that there is no spot on that sphere's surface that is preferential to any other -- ALL points on the surface are expanding apart from all other parts. Also note that someone on this surface can NOT view anything outside the surface, because the surface IS the entire Universe. There is no "outside" the sphere's surface in this representation, just like there is no "outside" our Universe. But don't take this representation too far -- even if it's the best, it still has several problems: 1) the expansion of a surface is two-dimensional, the expansion since the BB is three dimensional. 2) a ballon expands into 3-d space, and has a point within that space at which it starts. The expansion since the BB is not "into" anything, not even 4-d space. There is no point from the expansion started. 3) a sphere has a curved 2-d surface. As best we can tell, the 3-d space of our Universe is perfectly "flat." While it is hard to imagine a 3-d "something" that is "flat," the latter word has a mathematically meaning that applies to our Universe. So feel free to point to yourself and say, "From right here, part of our Universe began to expand about 13.7 billion years ago."
