词条 圆盘
描述: 圆盘是一个围绕共同中心做圆周共面运动的扁平物质系统。圆盘中的物质可以是气体、尘埃甚至恒星等多种不同物质。例如原恒星周围的吸积盘、年轻恒星周围的原行星盘、活动星系核周围的吸积盘以及星系盘。
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