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How do physicists know the proportion of matter to anti matter in the universe?
Wiki User
∙ 10y ago
We don't know the EXACT fraction of the observable Universe that is anti-matter, as opposed to the matter that constitutes our galaxy. We do know, however, that this fraction is quite small. If there WERE large sections of our Universe that consisted of anti-matter, the bounday layer between that section and the matter sections would have collisions between matter and anti-matter, and this would result in gamma rays coming from those collisions. Yes, it would be very few collisions and very rare gamma rays -- the density of inter-galactic space is a mere one atom per cubic meter-- but the gammas should be detectable. In thirty years of looking for them, we haven't found them. From this are pretty much forced to conclude that the entire observable Universe consists of the same matter stuff of our Local Cluster.
Wiki User
∙ 10y ago
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What is the only concept in the universe that cannot be truly classified as a form of matter?
Anti- Matter
Why is there only matter not anti matter?
They are mirror images of the other: protons have a certain weight and are positively charged, anti-protons have the same weight but are negatively charged. Antimatter is just matter with an opposite charge.
Is it accurate to describe the physical universe as composed of only matter and energy?
Yes. Everything in the universe is made of either matter (like water, animals, plants) and energy (like light) . The two are actually closely related. From a scientific standpoint, the physical universe consists of significantly more items than matter and energy. Several esoteric things such as anti-matter and dark matter are known to exist, and, in fact, may compose a significant portion of the physical universe.
Why is the universe expanding and what force is it expanding into is it anti gravity?
The initial expansion of the universe was caused by the Big Bang's explosion of matter. Just as explosions here on earth cause expansion, so it was then. The math today, however, shows that the universe should be compressing again, as the energy lost over time would then be overridden by gravitational forces pulling everything back together. I'm sorry to say there's no such thing in our universe as anti-gravity, though. The universe's fate is generally accepted to be expansion forever at an ever slowing rate. To answer as to why this occurs, dark energy and dark matter are the forces at work - not anti-gravity.
Is there a large enough quantity of anti-matter to destroy the universe?
Theoretically and mathematically... yes. According to Newton's law every time there is an action, an equal and opposite reaction will occur as well. Meaning every time there is an even in space that creates matter, the same amount of anti-matter will also be created.
What is the matter antimatter reaction called?
When matter and anti matter is combined, they are both annihilated, so it is called annihilation. This is why physicists are so confused - we don't know why there is matter left in this universe, if matter and anti matter were both created in equal quantities in the big bang.
Are elements matter?
Yes. not only elements all particle in the universe are matter. From Sambit Pal India. *********************** Anti particles are not matter they are anti-matter.
What is the only concept in the universe that cannot be truly classified as a form of matter?
Anti- Matter
Who created anti-matter?
No one, its forms when another particle in a different universe is made.
Is there a large enough quantity of anti-matter to destroy the universe And where is it located?
It seems the Universe consists almost entirely out of matter - that is, there are no significant amounts of antimatter. Why there is more matter than antimatter is an unsolved problem.
Is it possible that the other 50 percent of missing antimatter comprises the matter inside the black holes at the center of a galaxy?
One of the unsolved questions about our Universe is why it is composed almost entirely of matter. In our understanding of our Universe, the ratio of matter to anti-matter should be about 50-50. Saying, "All the anti-matter went into the super-massive black holes (smbh) at the center of galaxies" doesn't solve very much. It just leads to the question, "Why did only anti-matter go into smbh, and not matter?" There is SOMETHING about our Universe that favors matter over anti-matter. We just don't yet know what that something is. Simply saying that it is something that makes anti-matter, but not matter, go into smbh doesn't really solve much.
What was destroyed within the first seconds after the big bang?
Virtually all matter and anti-matter were annihilated shortly after the universe started expanding. Only a fraction of a percent of all matter survived that annihilation, and virtually no anti-matter.
Why are you in this universe?
I am in this universe as the other contains my anti-matter self. If I were to meet my anti-matter self, we would both annihilate immediately. Also the collective atoms that make up myself all originated in this universe. The universe contains the same number of atoms always, at least this one does. So I will be always be here in some form or fashion. Hopefully form!
What was there in the universe when it began?
Sub-atomic particles of matter and anti-matter, that all clumped/combined to form various things... That is the best I can describe it...
What does the big bang theory not explain?
Why our Universe is composed almost entirely of matter, with almost no anti-matter in it.
Do you have any thing like anti gravitational force in the universe?
There is a force called as gravitational force in the universe. The most beloved scientist, Newton has derived the law of gravity. But it has never been explained that as to why there is force of attraction and not the force of repulsion. When there is the force of attraction, there has to be the corresponding force of repulsion in the nature. You can not have the isolated north pole, with out the presence of south pole. So you have the force of attraction between matter to matter. You have force of attraction between anti-matter to anti-matter. So there has to be force of repulsion between matter to anti-matter. So the matter will repel the anti-matter in the space. So you have lost the universe (universes) in the space. The presence of matter is the proof that the anti-matter exists in the space in exactly equal amount. This is subjected to the inter conversion of matter into energy as per the law of Einstein, that is E = m c 2. The law of gravity is stated as F = G m 1* m 2 / r 2. If one of the mass is anti-matter, then the formula is : minus F = G (minus m 1)* m 2. Here the value of F also becomes negative. So that becomes the force anti to the force of gravity. That is force of repulsion. Hence proved.
Why is there only matter not anti matter?
They are mirror images of the other: protons have a certain weight and are positively charged, anti-protons have the same weight but are negatively charged. Antimatter is just matter with an opposite charge.
