Glossary term: 反物质
Description: 20 世纪初，理论物理学家意识到，每一种粒子都应该有一种相应的反粒子——一种质量相同，但性质完全相反，特别是电荷相反的粒子。几年后，人们发现了电子的反粒子——正电子，其质量与电子相同，但电荷相反。对于某些中性粒子，如光子，其反粒子就是其自身。当粒子和相应的反粒子相遇时，它们会湮灭形成光子。反粒子构成反物质，而我们的宇宙似乎主要由物质而不是由反物质构成。而这一切之所以发生的细节，仍是一个正在研究的课题。
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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
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