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行星八大行星

编辑 播报

行星概况

一般来说,行星的直径必须在800公里以上,质量必须在5亿亿吨以上。

水星

按照这一定义,截至2013年,太阳系内有8颗行星,分别是:水星(Mercury)、金星(Venus)、地球(Earth)、火星(Mars)、木星(Jupiter)、土星(Saturn)、天王星(Uranus)、海王星(Neptune)。

国际天文学联合会下属的行星定义委员会称,不排除将来太阳系中会有更多符合标准的天体被列为行星。在天文学家的观测名单上有可能符合行星定义的太阳系内天体就有10颗以上。

行星可见行星

行星是自身不发光的,环绕着恒星运行的天体。一般来说来行星需要具有一定的质量,行星的质量要足够的大,以至于它的形状大约是圆球状,质量不够的被称为小行星。“行星”这个名字来自于它们的位置在天空中不固定,就好像它们在行走一般。

行星和“新地平线”号

太阳系内的肉眼可见的5颗行星是:水星、金星、火星、木星、土星。人类经过千百年的探索,到16世纪哥白尼建立日心说后才普遍认识到:地球是绕太阳公转的行星之一,而包括地球在内的八大行星则构成了一个围绕太阳旋转的行星系——太阳系的主要成员。行星本身一般不发光,以表面反射恒星的光而发亮。在主要由恒星组成的天空背景上,行星有明显的相对移动。离太阳最近的行星是水星,以下依次是金星、地球、火星、木星、土星、天王星、海王星。

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