Glossary term: Antimatéria
Description: No início do século XX, os físicos teóricos perceberam que para cada tipo de partícula deveria existir um tipo correspondente de antipartícula – uma partícula com a mesma massa, mas com propriedades opostas, em particular carga elétrica oposta. Alguns anos depois, foi descoberta a antipartícula do elétron: o pósitron, que tem a mesma massa do elétron, mas carga elétrica oposta. Para algumas partículas neutras, como o fóton, a antipartícula é a mesma que a própria partícula. Quando uma partícula e a sua antipartícula correspondente se encontram, elas podem se aniquilar, formando fótons. Nosso universo parece ser composto principalmente de matéria, e não de antimatéria, formada por antipartículas. Os detalhes de como isso aconteceu são objeto de pesquisas em andamento.
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See this term in other languages
Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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In Other Languages
- Árabe: المادة المضادة
- Bengali: প্রতিপদার্থ (Antimatter)
- Alemão: Antimaterie
- Inglês: Antimatter
- Espanhol: Antimateria
- Francês: Antimatière
- Hindi: अँटीमॅटर (प्रतिपदार्थ)
- Italiano: Antimateria
- Japonês: 反物質 (external link)
- Marathi: अँटीमॅटर (प्रतिपदार्थ)
- Chinês Simplificado: 反物质
- Chinês Tradicional: 反物質
Related Media
The discovery of positron
Caption: This historic photograph shows the track of a positron moving through a cloud chamber from bottom to top. When a charged particle moves through a cloud chamber it leaves behind a line of condensation, making its path visible. Cloud chambers are normally build with magnetic fields. This curves the path of the charged particle, with the curve of the path giving more information about the properties of the particle.
Here we see the first positron (the antiparticle of an electron). A thick horizontal band in the middle is a lead plate in the cloud chamber that slowed the particle down, causing the positron's path to curve more sharply after crossing the plate. This image, taken in 1932, provided the first clear visual evidence of the positron.
The discovery of the positron confirmed that antimatter exists and opened an important field of research in modern physics.
Credit: Carl D. Anderson
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License: PD Public Domain icons
