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被踢出九大行星的冥王星到底有多可怕?冥王星是太阳系中充满神秘魅力的星球,因为它一直在我们遥不可及的太阳系边缘,它与地球的距离超过了五十亿公里,运行轨道。与其他绕着行星不同,冥王星的运行轨道呈现为极其扁长的椭圆形,与太阳的平均距离约五十九亿公里,公转周期约二百四十八个地球年。也就是说,冥王星上一年相当于地球上的二百四十八年,在我们的有生之年也无法看到冥王星绕太阳公转一周。冥王星到底有多小,它比月球还要小一点,直径大约两千四百千米,质量只有月球的十分之一,大约是地球质量的百分之零点二。人们一度将冥王星作为太阳系的第九大行星并写入教科书。但在二零零六年,国际天文联合会通过一次会正式将冥王星踢出了九大行星的行列,并将它定义为一颗矮星星。那么,冥王星为什么会被踢出行星俱乐部?一九三零年,天文学家汤博认为,在海王星之外,一定还存在另一颗行星。它通过比对分析夜空,照片中天体位置的变化,在茫茫星海中发现了一颗移动的光明。这就是当时被认为是必九大行星的冥王星。一九九二年后,科学家在科学家在陆续发现了一些质量与冥王星相似的天体,开始挑战冥王星的行星地位。二零零五年发现的细神星质量甚至比冥王星质量多出百分之二十七。天文学家们在经过研究和讨论后,重新定义了行星概念。一个天体要成为行星,必须要满足三个条件。第一条当然是它一定要围绕恒星公转。第二是要具有足够大的治疗来克服固体引力,达到流体静力平衡的形状,也就是近似于球体。第三个是必须清除运行轨道范围。也就是说公转轨道内不能有比它更大的天体,冥王星被降格为矮行星的原因就是不符合第三条。因为在他所处的科一博带存在数以一计的由严氏合并组成的剧本。虽然冥王星被排除在行星之外,但人们对他的好奇和探索从来都没有停止。二零零六年,新视野号正式发射升空,跨越广阔的太阳系,航行了将近十年,于二零一五年抵达冥王星,成为人类首个造访冥王星的探测器。它发出的通讯信号大约需要四个小时以上才能传回地球,让我们有幸目睹冥王星的庐山真面目。韩国在二十世纪九零年代去世后,他骨灰部分搭乘新视野号探测器飞向他所发现的奔跑线,因此他也成为了人类最远的太空游客。冥王星的名字普鲁托来自罗马神话中的朋友,是灵魂世界的主宰者,相当于阎王的角色,听上去似乎是挺可怕的。如果你站在冥王星的表面,会看到怎样的景象,首先映入眼帘的是稀薄的大气层,其中大部分都是氮气、甲烷和一氧化碳。对人类而言,这些气体是有毒的。由于冥王星的公转轨道是椭圆形的,近日点为四十四亿千米,远日点为七十四亿千米,其表面温度只有约零下二百二十九摄氏度。

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