Glossary term: 等离子体
Description: 等离子体是一种准中性的（即电荷平衡的）气体，其中相当一部分粒子是带正电的离子和带负电的电子，通常与分子和中性原子混合在一起。等离子体的性质与普通的中性气体截然不同，因此等离子体被认为是“物质的第四态”。带正电的离子和带负电的电子使等离子体能够导电。等离子体可以在高温下形成（如恒星中），也可以通过光致电离形成（如星际气体中）。等离子体存在于恒星、星际介质、太阳系行星之间的空间（以太阳风的形式）、行星磁层以及星系之间的空间中。据估计，可观测宇宙中 99% 以上的普通物质（不包括暗物质和暗能量）都处于等离子态。
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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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