What is Antimatter?
{{Antimatter}} '''Antimatter''' is a term in [[particle physics]]. Antimatter is a material composed of [[antiparticle]]s. These have the same [[mass]] as particles of ordinary matter but have opposite [[Electric charge|charge]] and properties, such as [[lepton]] and [[baryon]] number. Encounters between a particle and an antiparticle led to both of them being destroyed. This gives rise to high-energy [[photons]] ([[gamma rays]]), [[neutrino]]s, and lower-mass particle–antiparticle pairs. == What is it made of? == In [[physics]], all the [[elementary particle]]s, or the basic building blocks of the things we can touch, come in pairs. Each [[particle]] has what is called an [[antiparticle]]. This may look and act just like the regular particle, except for one major difference. An example is the [[electron]] and the [[positron]]. Other antimatter particles are the same way, where they have the same weight, and look and act the same as regular particles, but their electrical charge is the opposite of regular particles. [[Antihydrogen]], for example, has the positron, which is positively charged, [[orbit]]ing around an [[antiproton]], which is negatively charged, which is the opposite way regular [[hydrogen]] looks, which has the electron ([[negative charge]]), orbiting around a proton ([[positive charge]]). == Annihilation == [[Albert Einstein]] found a formula that can show how much [[energy]] a certain amount of something has, whether it is [[matter]] or antimatter. This formula is <math>E=mc^2</math>, and is one of the most well known equations. In simple terms, if you take the [[mass]] of something and then [[multiplication|multiply]] it by the [[speed of light]], and then multiply it by the speed of light again, you will get how much pure energy a given piece of something has. Since the speed of light is such a big number, this means that even a small amount of matter can have a lot of energy (it has been projected to be 4 times more effective per mass than nuclear fission). In 1928, the physicist [[Paul