Accelerating expansion of the universe Independent lines of evidence from Type Ia supernovae and the CMB imply that the universe today is dominated by a mysterious form of energy known as dark energywhich apparently permeates all of space. When the universe was very young, it was likely infused with dark energy, but with less space and everything closer together, gravity predominated, and it was slowly braking the expansion. But eventually, after numerous billion years of expansion, the growing abundance of dark energy caused the expansion of the universe to slowly begin to accelerate. Apparently a new unified theory of quantum gravitation is needed to break this barrier.
The first, and main, problem is the very existence of the big bang. One may wonder, What came before?
If space-time did not exist then, how could everything appear from nothing? Explaining this initial singularity—where and when it all began—still remains the most intractable problem of modern cosmology.
Newsweek magazine of November 9, The forces loosed were—are—remarkably miraculously?
If the Big Bang had been slightly less violent, the expansion of the universe would The big bang theory a prevailing been less rapid, and would soon in a few million years, or a few minutes—in any case, soon have collapsed back on itself.
If the explosion had been slightly more violent, the universe might have dispersed into a soup too thin to aggregate into stars. The odds against us were—this is just the right word—astronomical.
The ratio of matter and energy to the volume of space at the Big Bang must have been within about one quadrillionth of 1 percent of ideal. Take but degree away see above, the one quadrillionth of 1 percent margin for error.
The big bang theory does not describe the birth of the universe … Another theory describing even earlier times will be needed to explain the original creation of the universe.
Reported in its January issue the magazine Scientific American. Many scientists did not like the idea that the universe had a beginning, a moment of creation. The ideas that prove to be of lasting interest are likely to build on the framework of the now standard world picture, the hot big bang model of the expanding universe.
The full extent and richness of this picture is not as well understood as I think it ought to be, even among those making some of the most stimulating contributions to the flow of ideas.
Phillip James Edwin PeeblesPrinciples of Physical Cosmology Preface Once we overcome our fear of being tiny, we find ourselves on the threshold of a vast and awesome Universe that utterly dwarfs—in time, in space, and in potential—the tidy anthropocentric proscenium of our ancestors.
We gaze across billions of light-years of space to view the Universe shortly after the Big Bang, and plumb the fine structure of matter. We peer down into the core of our planet, and the blazing interior of our star. We read the genetic language in which is written the diverse skills and propensities of every being on Earth.
We uncover hidden chapters in the record of our origins, and with some anguish better understand our nature and prospects. We invent and refine agriculture, without which almost all of us would starve to death.
We create medicines and vaccines that save the lives of billions. We communicate at the speed of light, and whip around the Earth in an hour and a half.
We have sent dozens of ships to more than seventy worlds, and four spacecraft to the stars. We are right to rejoice in our accomplishments, to be proud that our species has been able to see so far, and to judge our merit in part by the very science that has so deflated our pretensions.
Carl SaganPale Blue Dot: A Vision of the Human Future in Space p. But then, of what is it a fluctuation and how did this in turn begin to exist?
In my view, the question of origin seems always left unanswered if we explore from a scientific view alone. Anaxagoras had envisaged that at one time "all things were together" and that the motive force for the universe originated at a single point Anaximander on the other hand wanted a universe determined by "the infinite" and needed an "eternal motion" to explain the balancing process of things coming into being and passing away in an eternal universe Clark, in Measuring the Cosmos: How Scientists Discovered the Dimensions of the Universe The big bang was not an explosion in space; it was more like an explosion of space.
It was not a bomb going off at a particular spot that we can identify as the center of the explosion. Tamara Davis, Charles Lineweaver, "Misconceptions About the Big Bang," Scientific American March, We are privileged to be part of the first generation who can claim to have a respectable, rational, and coherent description for the creation and evolution of the universe.
The Big Bang model offers an elegant explanation of the origin of everything we see in the night sky, making it one of the greatest achievements of the human intellect and spirit.The Big Bang theory is the prevailing cosmological model that describes the early development of the Universe.
According to the theory, the Big Bang occurred approximately billion years ago, which is thus considered the age of the universe. “The Big Bang theory is the prevailing cosmological model for the early development of the universe. The Big Bang model suggests that at some moment all matter in the universe was contained in a single point, which is considered the beginning of the universe.
The Big Bang theory is the prevailing cosmological model for the early development of the universe. According to the theory, the Big Bang occurred approximately ± billion years ago, which is thus considered the age of the regardbouddhiste.com this time, the universe was in an extremely hot and dense state and began expanding rapidly.
Right now, the prevailing theory of how the universe came about is commonly called the Big Bang theory. And really is just this idea that the universe started as kind of this infinitely small point, this infinitely small singularity.
The Big Bang was, according to the prevailing cosmological theory of the universe's early development, the event that led to the formation of the universe.. Big Bang may also refer to. Cosmologist Alexander Vilenkin believes the Big Bang wasn't a one-off event, but merely one of a series of big bangs creating an endless number of bubble universes.