It is very easy to answer-
First, I want to tell that , what is a universe?
A universe is a limitless space with billion of stars in it.
So,lets come to the point.There is no boundary in the universe as it is a very vast space and billion of other universe are also there.
I wish that you could understand it
A "no boundary" universe is a universe where the change in energy is positive or negative everywhere in the universe. Such a universe theory calls for everywhere expansion or everywhere contraction. The current central dogma in Astronomy is for such an expanding universe. The corrected Law of Gravity indicates that the universe is bounded and not expanding.
The Big Bang is the theory that was developed to describe the origins of the universe.
It is similar to the Big Bang theory. The ekpyrotic theory is, a theory that their is a parallel universe (More than one) In our universe.
In 1924, Alexander Friedman noted that the equations of general relativity have only two solutions: an expanding universe or a contracting universe. Independently of that work, in 1927 Georges LeMaitre used those same equations to show that an expanding universe was the only reasonable description of our Universe. His ideas were later described as a "big bang" by those who opposed them.
Ptolemy created the geocentric theory of the universe and Nicolous Copernicus created the heliocentric theory of the universe.
The no boundary universe theory was formulated in 1983.
the year of the no boundary theory is 1983.
1983
1983
ooval and loonleo
the theory produced by Stephen Hawking and John Hartle in 1983 that the universe has no boundaries
That is, more or less, the description of the Big Bang.
A "no boundary" universe is a universe where the change in energy is positive or negative everywhere in the universe. Such a universe theory calls for everywhere expansion or everywhere contraction. The current central dogma in Astronomy is for such an expanding universe. The corrected Law of Gravity indicates that the universe is bounded and not expanding.
proposes that the universe looks the same on large scales to observers.
It is the idea that the universe will continue to expand forever. By contrast, the closed theory states that gravity will eventually cause the universe to shrink. (I think) In addition to the above. Essentially it is the theory that the universe has no boundary and is not closed in on itself in any way. The shape of the universe in this case must be either "flat" or "curved" to some extent, but not curved enough to form a cylinder, sphere, ellipsoid or torus.
The universe or universality of created things; -- so called from the order and harmony displayed in it., The theory or description of the universe, as a system displaying order and harmony.
The universe or universality of created things; -- so called from the order and harmony displayed in it., The theory or description of the universe, as a system displaying order and harmony.