what EXACTLY is anti-matter?
338341
Anti matter is negative version of matter.To differentiate the matter and antimatter we consider the atomic levels of matter.Our own matter is made with atom of centraly proton of positive charge & charge less neutron called nucleus.And a negative charged electrons revolving around it.But in antimatter nucleus is  negative charged proton(anti proton)& electron of positive charge (anti electron) revolving around it.\nI think that matter and antimatter repell each other,have a negative gravitation.
805625
Time is completely relative.  It bends with the curvature of space.  Space is the absence of matter and is what separates matter from matter and matter from anti-matter.  Anti-matter is the opposite of matter and is responsible for anomalies like black holes and is believed to be the center of galaxies.  Anti-matter and matter form energy when they combine.  So far as we can tell, it looks like a giant flash of light when this occurs.\n\nTo answer your question:\nWhen time is removed from the equation, everything comes to a standstill.  It would be the same if you took away energy.  There would be nothing but stuff standing motionless.  When space is removed from the equation, all matter and anti matter are combined and as a result, pure energy is given off as a byproduct.  If matter is removed from the picture, the only thing that would be left is anti matter, space and energy.  Everything would be dark because there wouldn't be anything to give off light, but there would still be gravitational forces at work.
882919
Matter is something that has mass. Mass, according to the general theory of relativity, is caused by the warping of space. A particle that warps space is said to have mass. These particles are known as matter. The terminology is kind of redundant.\n\nNo one knows what the actual particles are made of. Wheeler tried to explain everything as being a warping or curvature of space. But failed.\n\nThe smallest units of matter, that we know of, are leptons (such as electrons) and quarks.
374022
There are already antimatters existing in and outside our galaxy. But the ratio of antimatter to matter is rather small. More often than not, when both matter and antimatter come together, large amount of energy is release. The energy emitted is large enough to create another particle.
988173
The gravitational interaction of antimatter with matter or antimatter has not been conclusively observed by physicists. While the overwhelming consensus amongst physicists is that antimatter will attract both matter and antimatter at the same rate matter attracts matter, there is a strong desire to confirm this experimentally. If the gravitational interactions between antimatter and matter were found to be repulsive it would be a potential violation of conservation of energy – arguably the most fundamental law of physics.
353833
There is conjecture that the universe began with a big bang, out of nothing. If matter formed, then anti-matter also must have formed at the same time to have the various laws of physics as we know them hold good. Some scientist postulate that the big mishap in Siberia in 1906 could have happened  because of the passing of a small quantity of anti-matter. Remember, for anti-matter, we could be as dangerous as is is to us. \n\nI think anti-matter has been created in small quantities in labs, and yes you are right, it could be harnessed to meet with our energy requirements.
595862
I don't know what everyone else here is on but we've had fusion (hydrogen) weapons for decades. Fusion weapons are capable of destroying planets as there is no real limit to how powerful they can be. There are more powerful alternatives however. Matter-Antimatter reactions can be made vastly more powerful then fusion reactions since the masses are completely transformed into energy whereas only a small portion of mass is converted into energy in fusion reactions. The problem of course is that anti-matter is annihilated upon exposure to any matter so storing it is the biggest problem in making such an idea practical and it would probably never make it to bomb form let alone the problems people have making 1/1000th of a milligram of the stuff for any sustained period.
859901
Aside from the fact that particles having opposite electrical charges do NOT constitute the definition of "anti-matter", you also do not find free quarks roaming around, so it would be difficult for any quark to find another quark of opposite charges. By "free quark", I mean quarks that are not confined inside a proton, neutron, or other massive particles made from quarks. The reason we don't find free quarks is because the "Strong" force (which is responsible for keeping the atomic nucleus together and also for keeping quarks confined) is a force whose strength grows stronger as the particles gets further apart. That's right! This is exactly the opposite of all other forces.
1012180
Personally I think the reason that there is less antimatter than matter has something to do with the arrow of time.  The last time I checked there was still not a very good explaination of why there is more matter than antimatter.  Its still an outstanding problem in physics.  Its a subject that, as a physicist, I'm very interested in.  Who knows, maybe you'll come up with an explaination.
8936
Corresponding to each kind of particle, there is an associated antiparticle with the same mass and spin. Some particles, such as the photon, are identical to their antiparticle; such particles must have no electric charge, but not all charge-neutral particles are of this kind. The laws of nature were thought to be symmetric between particles and antiparticles until CP violation experiments found that time-reversal symmetry is violated in nature. The observed excess of baryons over anti-baryons in the universe is one of the primary unsolved problems in cosmology.
647158
no.  The most anti-matter they can produce at one time is incredibly small, only a few particles the size of electrons.
518179
I can think of two things you might be referring to... see my references.\n\nThe color glass condensate is an extreme type of matter theorised to exist in heavy ion collisions.\n\nThe second refers to materials that are "frustrated", that is have more than one ground-state.
769964
The definations wanted by you are given below-\n\nIn physics, matter is commonly defined as the substance of which physical objects are composed, not counting the contribution of various energy or force-fields, which are not usually considered to be matter per se (though they may contribute to the mass of objects). Matter constitutes much of the observable universe, although again, light is not ordinarily considered matter. Unfortunately, for scientific purposes, "matter" is somewhat loosely defined.\n\nMass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. Mass is a central concept of classical mechanics and related subjects, and there are several forms of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames.\n\nAn elementary particle is a particle with no measurable internal structure, that is, it is not a composite of other particles. They are the fundamental objects of quantum field theory. Elementary particles can be classified according to their spin, with fermions having half-integer spin and bosons integer spin.\n\nSpace has been an interest for philosophers and scientists for much of human history. The term is used somewhat differently in different fields of study, hence it is difficult to provide an uncontroversial and clear definition outside of specific defined contexts. Disagreement also exists on whether space itself can be measured or is part of the measuring system. (See Space in philosophy.) Many fields use an operational definition in which the units of measurement are defined, but not space itself.\n\nIn chemistry and physics, an atom (Greek  átomos meaning "indivisible") is the smallest particle of a chemical element that retains its chemical properties. \n\nA chemical element, often called simply an element, is a substance that cannot be decomposed or transformed into other chemical substances by ordinary chemical processes. All matter consists of these elements and as of 2006, 117 unique elements have been discovered or artificially created. The smallest particle of such an element is an atom, which consists of electrons centered about a nucleus of protons and neutrons.\n\nIn chemistry, a molecule is an aggregate of two or more atoms in a definite arrangement held together by chemical bonds. Chemical substances are not infinitely divisible into smaller fractions of the same substance: a molecule is generally considered the smallest particle of a pure substance that still retains its composition and chemical properties. Certain pure substances (e.g., metals, molten salts, crystals, etc.) are best understood as being composed of networks or aggregates of atoms or ions instead of molecular units.\n\nIn particle physics, antimatter extends the concept of the antiparticle to matter, wherein if a particle and its antiparticle come into contact with each other, the two annihilate —that is, they may both be converted into other particles with equal energy in accordance with Einstein's equation E = mc2. This gives rise to high-energy photons (gamma rays) or other particle–antiparticle pairs-.
68885
I think that simple answer is, no one knows. We have theories, but we really do not know. \n\nFor example, maybe the antimatter particles decay much faster (see reference). Maybe the universe is only locally mainly matter, and there are other patches of the universe that are locally mainly antimatter (see reference). \n\nWhat science is, is a series of problems and questions that scientists attempt to answer. You have asked one of those questions that is so far, in the unresolved category.
465903
The positron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1, a spin of 1/2, and the same mass as an electron. When a low-energy positron annihilates with an electron, their mass is converted into the kinetic energy of two gamma ray photons (See electron-positron annihilation.).
85426
nothing what's the antimatter with you! seriously though if you mean antimatter, it's a form of matter in which most of it's properties are reversed.
480431
Yes. Part of the idea of antimatter is in some equations containing squares, to solve for that variable you must have a positive and negative answer. Therefore an opposite or anti- thing must exist. Antimatter in this case. So if the E=mc^2 works for matter than it should work for anti-matter.\n\nHowever, as the theory of antimatter states - rather than be like matter where something travelling the speed of light can produce matter and mass, the antimatter will become energy and destroy mass when it comes in contact with matter. \n\nHope that makes some sense. Antimatter is an annoying thing.