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土星是太阳系第六颗行星,也是体积第二大的行星,有着美丽的环,在地球上以一般的望远镜即可看见,土星、木星、天王星和海王星表面都是气体,故自转都相当快。土星的环主要是由冰及尘粒构成,据科学家推测,可能是因某卫星受不了土星强大的引力而解体成碎片。

土星的环平面与土星公转面不在同一个平面上,故当土星公转至某一位置时,土星的环平面刚好与我们的视线平行,我们在地球上便无法看到此一土星环,因为土星环实在太薄了,我们无法从侧面看到,另外,当土星环与阳光平行时,因环平面没有受光,故我们也无法看到。

土星是从太阳算起的第六颗行星,也是一个几乎和木星一样大的气体巨星,赤道直径约公里。土星可能有一个岩石与冰构成的小核心,周围是金属氢(液态氢,性质如同金属)构成的内地函。在内地函的外面是是由液态氢构成的外地函、融合成为气态的大气层。

土星的云层形成带状与区层,颇似木星,但由于外层的云薄而显得较模糊。风暴和漩涡发生在云中,看起来为呈红或白色椭圆。

小主,这个章节后面还有哦,请点击下一页继续阅读,后面更精彩!土星有一个极薄但却很宽的环状系统,虽然厚不到一公里,却从行星表面朝外延伸约公里。主环包括数千条狭窄的细环,由小微粒和大到数公尺宽的冰块所构成。土星已发现62颗卫星,其中有些在光环内运行,这会施加重力,影响到环的形状。有趣的是,卫星中的7颗为共内轨道,与别的卫星分享同一个轨道。天文学家相信这些共用轨道的卫星为来自同一卫星,但后来碎裂的卫星。

天王星是太阳系第七颗行星,在太空船未到达以前,人类并不知道它也有如土星一样美丽的环,天王星是人类用肉眼所能看到的最远的一颗行星,但是,如果你没有受过专业的训练的话,是很难在众星里寻到的。

天王星(Uranus)的最大特徵是自转的倾斜度很大。一般行星的自转轴与其公转面都很接近垂共直,唯独天王星的自转轴成九十八度的倾斜,几乎是横躺着运行。因此,太阳有时整天都照在北极上,而这时的南半球就全天黑暗。

天王星表面发出带有白色的蓝绿光彩,因此推测它的大气可能含有很多甲烷。而天王星的直径约为地球的四倍,质量约十四倍,但密度却不及地球的四分之一,这是因为天王星与其他木星型行星一样,它们都是以氢、氦等气体为主要成分形成的。

九条细环天王星的赤道上空也有九条环,这九条环合起来的宽度约十万公里,大约为土星环三分之一宽。

天王星的环之构造及成分与土星及木星的环大不相同,土星环是由几千条环夹着很狭窄的空隙形成的,而天王星的九条环却彼此都隔得很远。九条环中内侧的八条宽约十几公里,最外侧的一条则宽达一百公里以上。

这些,构筑起了太阳系除太阳外的大半物质。

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