Clemmie Burkleo: If you add all the positive forces and matter in the universe to all the negative forces and antimatter in the universe, the sum would be zero. At the point of the big bang, the universe was infinitely small and infinitely hot. At time > 0, the universe began expanding (the big bang). within 1 billionth billionth second, the universe was the size of a marble. As it expanded it cooled. The only thing there was was matter and antimatter. Within another billionth of a second, the universe was the size of out solar system. It was expanding faster than the speed of light. And it was cooling as an incredible rate. It has now cooled to an average temperature of 2 degrees. It will continue to expand and cool forever.See http://en.wikipedia.org/wiki/Ultimate_fate_of_the_......Show more
Tana Dumoulin: The hypothesis behind the Big Bang theory (called the Primeval Atom hypothesis) is that the universe was incredibly dense with energy.The idea that the universe! started as a 'speck' comes from the fact that the word 'singularity' is often understood as being a single point.The word can also mean an infinite state.It is possible that the universe began everywhere at once, with an unbounded level of energy (the singularity is the unbounded level of energy, not the infinitesimal size of the universe).In other words, it is possible that the universe was already infinite in size when it began, and has been expanding ever since (the distances within the universe keep increasing with time).If that is so, then some of that energy was transformed into matter (E = mc^2 running backwards as m = E/c^2); since the universe had an unbounded amount of energy available, then thre was a sufficient amount for the matter that did get formed.We know from lab experiments (e.g., in super-colliders) that matter can indeed be created from pure energy.We also know (from nuclear reactor and from nuclear weapons) that matter can be turned back into pure en! ergy.The matter was created AFTER the universe began to expand! from it very high state of density/temperature. Some 3 to 20 minutes after the beginning.http://en.wikipedia.org/wiki/Big_bang_nucleosynthe......Show more
Octavio Roylance: Oh yeah, I'm not claiming to be an expert on the theory, or else I wouldn't be asking. I just want to see if there's an explanation that I'm not aware of. Thank you.
Randal Deyarmond: There is no "conservation of mass" law - there is a law of the conservation of energy (energy can change forms but cannot be destroyed).Matter can be created and destroyed - matter is a very condensed form of energy, according to Einstein's e-mc^2 equation.The Big Bang is what created the universe and all the matter in it. About 3 minutes after the Big Bang, things had cooled down enough so that hydrogen and helium (and some lithium and deuterium) could form - before that the universe was simply an incredibly hot plasma.The laws of the conservation likely developed during the Planck Era, about 10^-43 seconds ! after the Big Bang....Show more
Vern Serratos: Nice. I read up on the conservation of mass, and it said that energy, momentum, energy, and mass are all different aspects of the same physical qualities, so to make things easier, my teacher made a simple view of the theory instead of saying how and when it would break down? darn...
Luther Plagmann: First of all, conservation of mass is not an absolute law. Einstein showed that mass is equivalent to an enormous quantity of energy, which is proven by the existence of atomic weapons â€" Hiroshima was destroyed by the conversion of about 30 grams of matter into energy.So the matter in the universe actually condensed out of the energy of the Big Bang event. So where did that come from? It's hard to answer that definitively because the laws of physics don't survive the energy density of the presumed Big Bang event. There are a few leading explanations.String theory, or rather the extension of it called M theory, sugges! ts that the Big Bang was caused by the collision of two hyperdimensiona! l membranes, called "branes" for short. It has been calculated that a collision like this would happen every few trillion years, allowing plenty of time for the universe to run out of energy and die before a new one was created. This theory, as you can imagine, will be very, very difficult to prove, since the branes exist outside of the universe and thus are perpetually unobservable.Another explanation relates to the Higgs boson, which is the particle which it is believed is responsible for the transmission of gravitational force. The Higgs has never been observed in the laboratory because no particle accelerators yeat exist that can generate it, but it is possible that the new Large Hadron Collider in Europe, which will be turned on this year, will be powerful enough to generate them. Anyhow, it's hypothesized that in the very early stages of the universe, the rapidly cooling and expanding cosmos precipitated a Higgs field which was stretched out into a condition of NEGATI! VE energy. This was just like imposing a gargantuan negative-gravity field on everything that existed, which drove space out at a tremendous rate far higher than the speed of light. In fact, in less than 10^-30 seconds the universe expanded from smaller than the diameter of a hydrogen atom to larger than the current size of the Solar System!This Higgs field in its negative energy state was extremely unstable, however, and it snapped back to a zero energy state after that 10^-30 seconds. But the energy released into the universe from that return to zero Higgs energy had to go somewhere, and it was absorbed by the creation of nearly all of the matter that we see in the universe today (only the preexisting matter excluded).If you'd like a more detailed explanation please search for "inflationary cosmology"....Show more
No comments:
Post a Comment