Changes

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*[http://en.wikipedia.org/wiki/1950 1950]

*[https://en.wikipedia.org/wiki/1950 1950]

==Definitions==

==Definitions==

*1: matter composed of ''antiparticles''

*1: matter composed of ''antiparticles''

:: a subatomic [[particle]] identical to another subatomic particle in [[mass]] but [[opposite]] to it in [[electric]] and [[magnetic]] [[properties]] (as sign of charge) that when brought [[together]] with its [[counterpart]] produces mutual [[annihilation]]; especially : a subatomic particle not found in ordinary [[matter]]

:: a subatomic [[particle]] identical to another subatomic particle in [[mass]] but [[opposite]] to it in [[electric]] and [[magnetic]] [[properties]] (as sign of charge) that when brought [[together]] with its [[counterpart]] produces mutual [[annihilation]]; especially : a subatomic particle not found in ordinary [[matter]]

==Description==

==Description==

In [[particle]] [[physics]], '''antimatter''' is the extension of the [[concept]] of the [http://en.wikipedia.org/wiki/Antiparticle antiparticle] to [[matter]], where antimatter is composed of antiparticles in the same way that [[normal]] matter is composed of particles. For example, a [http://en.wikipedia.org/wiki/Positron positron] (the antiparticle of the [[electron]] or e+

In [[particle]] [[physics]], '''antimatter''' is the extension of the [[concept]] of the [https://en.wikipedia.org/wiki/Antiparticle antiparticle] to [[matter]], where antimatter is composed of antiparticles in the same way that [[normal]] matter is composed of particles. For example, a [https://en.wikipedia.org/wiki/Positron positron] (the antiparticle of the [[electron]] or e+

) and an [http://en.wikipedia.org/wiki/Antiproton antiproton] (p) can form an [http://en.wikipedia.org/wiki/Antihydrogen antihydrogen] [[atom]] in the same way that an [[electron]] and a proton form a normal matter hydrogen atom. Furthermore, mixing [[matter]] and ''antimatter'' can lead to the [[annihilation]] of both in the same way that mixing antiparticles and [[particles]] does, thus giving rise to high-[[energy]] [http://en.wikipedia.org/wiki/Photon photons] (gamma rays) or other particle–antiparticle pairs. The result of antimatter meeting matter is an explosion.[1]

) and an [https://en.wikipedia.org/wiki/Antiproton antiproton] (p) can form an [https://en.wikipedia.org/wiki/Antihydrogen antihydrogen] [[atom]] in the same way that an [[electron]] and a proton form a normal matter hydrogen atom. Furthermore, mixing [[matter]] and ''antimatter'' can lead to the [[annihilation]] of both in the same way that mixing antiparticles and [[particles]] does, thus giving rise to high-[[energy]] [https://en.wikipedia.org/wiki/Photon photons] (gamma rays) or other particle–antiparticle pairs. The result of antimatter meeting matter is an explosion.[1]

There is considerable [[speculation]] as to why the observable [[universe]] is apparently almost entirely [[matter]], whether there exist other places that are almost entirely antimatter instead, and what might be possible if antimatter could be harnessed. At this [[time]], the [[apparent]] [[asymmetry]] of [[matter]] and antimatter in the visible [[universe]] is one of the greatest unsolved [[problems]] in [[physics]]. The [[process]] by which this [[asymmetry]] between particles and antiparticles developed is called [http://en.wikipedia.org/wiki/Baryogenesis baryogenesis].[http://en.wikipedia.org/wiki/Antimatter]

There is considerable [[speculation]] as to why the observable [[universe]] is apparently almost entirely [[matter]], whether there exist other places that are almost entirely antimatter instead, and what might be possible if antimatter could be harnessed. At this [[time]], the [[apparent]] [[asymmetry]] of [[matter]] and antimatter in the visible [[universe]] is one of the greatest unsolved [[problems]] in [[physics]]. The [[process]] by which this [[asymmetry]] between particles and antiparticles developed is called [https://en.wikipedia.org/wiki/Baryogenesis baryogenesis].[https://en.wikipedia.org/wiki/Antimatter]

[[Category: Physics]]

[[Category: Physics]]