Antimatter Hunter
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A balloon lifts an instrument package named BESS from the Antarctic ice in late 2007. During several days of observations from an altitude of more than 20 miles, BESS looked for particles of antimatter. [NASA/BESS] ...
Antimatter :
Antimatter is a substance composed of atoms made up of elementary particles that have the mass and charge of electrons, protons, or neutrons, their counterparts in ordinary matter, but for which the charge is opposite in sign.
Antimatter is interesting partly because of the spectacular and violent way in which it interacts with normal matter.
Antimatter has properties that are opposite those of normal matter - for example the positive charge on a proton is negative in an antiproton. When antimatter and normal matter come into contact, they annihilate spectacularly, releasing energy.
antimatter
A form of matter that is composed of particles that exhibit opposite quantum mechanical properties from particles of normal matter.
Antimatter
matter consisting of particles with charges opposite that of ordinary matter. In antimatter, protons have a negative charge while electrons have a positive charge.
Antimatter - A type of matter which annihilates ordinary matter on contact. For every particle, there is a corresponding antimatter particle. For example, the antimatter counterpart of the proton is the antiproton ...
antimatter: Matter composed of antiparticles, which upon colliding with a matching particle of normal matter annihilate and convert the mass of both particles into energy.
antimatter
matter consisting of particles that have the same mass and properties as their matter counterparts but opposite electrical charges
anti-tail ...
ANTIMATTER - Particles with properties opposite to those of "conventional" matter. Each matter particle has a corresponding "antiparticle." The antiparticle has the same mass, but opposite electric charge as its partner.
Antimatter- the exact opposite of matter; when matter meets the tiny amount of antimatter in the universe, the two annihilate each other (see antiparticle) ...
ANTIMATTER
Antimatter is matter that is composed of the counterparts of ordinary matter. For example, positrons are the antimatter counterpart of electrons; positrons have a positive charge instead of a negative charge.
antimatter - (n.)
A type of matter in which each particle (antiproton, antineutron, etc.) is opposite in charge and certain other properties to a corresponding particle (proton, neutron, etc.) of the same mass of the ordinary type of matter from ...
Antimatter
Matter made up of elementary particles whose masses are identical to their normal-matter counterparts but whose other properties, such as electric charge, are reversed.
Antimatter Matter composed of the antiparticles of normal matter. A particle and its antiparticle have a number of opposite properties. A proton is electrically positive; an antiproton is electrically negative.
Antimatter is not found naturally on Earth, except very briefly and in vanishingly small quantities (as the result of radioactive decay or cosmic rays).
antimatter Matter made of antiparticles, i.e., particles with identical mass and spin as those of ordinary particles, but with opposite charge and magnetic properties.
Antimatter
In 1965, Cowan, Atluri, and Libby suggested that the Tunguska event was caused by the annihilation of a chunk of antimatter falling from space.
Antimatter
In particle physics, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles....
The antimatter counterpart of an ordinary particle has the same mass and opposite charge of the ordinary particle (if it is not neutral).
Matter-to-Antimatter Ratio
The ratio of mass in particles to mass in antiparticles. For every type of particle, there is an antiparticle counterpart.
[16.5] MATTER-ANTIMATTER ASYMMETRY
[17.0] Quarks & Electroweak Unification
[17.1] YANG-MILLS THEORY ...
matter-antimatter propulsion (NASA Thesaurus) Spacecraft propulsion by use of matter-antimatter annihilation reactions. Matts (abbr) (NASA SP-7, 1965) = multiple airborne target trajectory system.
Same as matter-to-antimatter ratio. [LB90]
Particles
Fundamental units of matter and energy.
*The OSSE instrument completed the most comprehensive survey of the galactic center, and discovered a possible antimatter "cloud" above the center.
Antimatter-initialized fusion uses small amounts of antimatter to trigger a tiny fusion explosion. This has been studied primarily in the context of making nuclear pulse propulsion feasible.
Baryogenesis: a small difference between the reaction rates for matter and antimatter leads to a mix with about 100,000,001 protons for every 100,000,000 antiprotons (and 100,000,000 photons).
Universe grows and cools until 0.
where the symbols stand for Hydrogen with one proton (1H), hydrogen with a proton and a neutron (2H), also known as deuterium, a positron (e+) which is the positively charged antimatter form of an electron, and a neutrino.
The presence of matter-antimatter annihilation, plus all the X-rays and radio emission suggest that unusual things are happening in the center of our Galaxy. One hypothesis is that the center of our Galaxy contains a black hole.
Antimatter is based on the theory that particles have anti-particles that have the same mass but opposite charges. When the two meet there are explosive reactions and all the mass is turned into energy.
Recall that the positrons immediately interact with nearby free electrons, producing high-energy gamma rays through matter"antimatter annihilation. The neutrinos rapidly escape, carrying energy with them but playing no direct role in nucleosynthesis.
Tools such as radio telescopes and spectrometers are now helping us to find objects that were only theories such as black holes, antimatter, dark matter, and even earthlike planets.
It would be attracted to any source of antimatter and then neutralize it upon impact. He thought that the Delta Flyer was struck by a dark matter proto-comet in 2376 when the ship was impacted by an unknown phenomenon.
But if you spend much time around ten-year olds, you' ll find many of them already know about atoms, black holes, and antimatter.
Although the pp chain involves the fusion of hydrogen nuclei, the cores of stars still contain electrons that have been ionised or ripped off from their hydrogen or helium nuclei. When a positron collides with an electron, an antimatter-matter event ...
Another speculation is that the Milky Way is a barred spiral galaxy. In April 1997 scientists discovered a "fountain" of antimatter erupting from the center of the galaxy, raising new questions about the structure of the Milky Way.
Finally, OSSE detected the presence of an antimatter source in the center of the Milky Way, strongly suggesting the presence of a supermassive black hole there.
 See also: Universe, Energy, Earth, Light, Second
  
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