第1个回答 2006-12-21
清晨,当太阳从漫天红霞中喷薄而出,把万丈金光洒向大地,一种蓬勃向上的激情,就会油然而生。看到这个充满生机的世界,人们不能不热爱和赞美赐予我们生命和力量的万物主宰——太阳。
太阳是离我们最近的一颗恒星,太阳与地球的平均距离约14960万千米,太阳半径约为69.6万千米,是地球半径的109倍多。太阳的质量相当于地球质量的33万多倍,体积大约是地球的130万倍。虽然如此,她在宇宙中也只是一个普通的恒星。
太阳是一个自身发光发热的大火球,他的表面温度约为6000度,,越向内部温度越高。在高温高压下,每平方千米太阳表面所发出的能量相当于一个63000千瓦的发电站的能量,但其中只有二十二亿分之一的能量辐射到地球,它们是地球上光和热的主要来源。
太阳已经46亿岁了,现在已步入中年。它还可以继续平静地燃烧约50亿年。太阳在临终时,内部的氦将转变成更重的元素,亮度会增加到现在的一倍,体积也将不断膨胀,所有近日行星包括地球都将融入它的怀抱。在经过一亿年的红巨星阶段后,太阳终于耗尽了所有核燃料,在物质引力的作用下坍缩成一颗白矮星。
最后,当它把仅剩的由坍缩产生的引力能辐射完后,太阳最终将变为一颗冰冷的黑矮星。
土星是太阳系行星之一,按离太阳由近及远的次序是第六颗;按体积和质量都排在第二位,仅次于木星。它和木星在很多方面都很相似,也是一颗“巨行星”。从望远镜里看去,土星好象是一顶漂亮的遮阳帽飘行在茫茫宇宙中。它那淡黄色的、橘子形状的星体四周飘拂着绚烂多姿的彩云,腰部缠绕着光彩夺目的光环,可算是太阳系中最美丽的行星了。
古时候,我们称土星为“镇星”或“填星”,而西方则称之为克洛诺斯。无论是东方还是西方,都把这颗星与人类密切相关的农业联系在一起。
土星的美丽光环是由无数个小块物体组成的,它们在土星赤道面上绕土星旋转。土星还是太阳系中卫星数目最多的一颗行星,周围有许多大大小小的卫星紧紧围绕着它旋转,就象一个小家族。到目前为止,总共发现了23颗。土星卫星的形态各种各样,五花八门,使天文学家们对它们产生了极大的兴趣。最著名的“土卫六”上有大气,是目前发现的太阳系卫星中,唯一有大气存在的天体。
第2个回答 2006-12-20
水星是九大行星中最靠近太阳的行星,中国古代称水星是辰星。西方人叫它墨丘利,墨丘利是罗马神话中专为众神传递信息的使者,而水星也不愧为信使的称号:它是太阳系中运动最快的行星。水星公转平均速度为每秒48公里,公转周期约为88天。
由于水星距离太阳太近了,个头又小,人们平时很难看到它。水星的表面和月球表面极为相似。其上布满了大大小小的环形山。水星的大气极为稀薄,昼夜温差很大,白天表面温度可达427度以上, 黑夜最低温度可降到零下173度左右。
水星的半径为2440公里,是地球半径的38.3%。水星的体积是地球的5.62%,质量是地球的0.05倍。水星外貌如月,内部却像地球,也分为壳、幔、核三层。天文学家推测水星的外壳是由硅酸盐构成的,其中心有个比月球还大的铁质内核。
水星的自转周期为58.646日,自转方向与公转方向相同。由于自转周期与公转周期很接近,所以水星上的一昼夜比水星自转一周的时间要长得多。 它的一昼夜为我们的176天,白天和黑夜各88天。
水星没有卫星,因此水星的夜晚是寂寞的,那里没有“月亮”,除了太阳以外,天空中最亮的星是金星。
第3个回答 2018-07-31
土星可能变为恒星吗,为什么,木星呢?行星可能变为恒星吗?
这两个问题其实是一致的。理论上来说,有可能,只要吸收大量的物质即可。不过现实上,极难。我记得网络上有种说法,说木星不断通过太阳风捕获物质,可以不断增加质量最后引发核聚变成为恒星。不过这种说法仔细考量就能发现,不靠谱,太阳系形成已经50亿年,木星的质量还不到临界质量的八十分之一。再有五十亿年的寿命,质量要增加80倍,即便是指数级的增长也不可能达到。质量更小,距离更远的土星就更加没有希望了。
太阳内核有金属氢吗,什么是金属氢?
楼主知道金属氢可圈可点,我是无机化学课上才听到这个名词。不过,答案也是很肯定的,绝无可能。金属氢是在高压下,氢原子的电子轨道相互重叠杂化形成价带继而具有某些金属的性质。注意前提,外部电子轨道的杂化。拿到了太阳上会怎么样?高温远远能够将电子电离,形成游离态的自由电子和原子核,连核外电子都被剥离了,还谈什么化学构成呢?
慧星和小行星怎么形成的?
不妨参考百度百科。这里简单的说一点,彗星普遍认为是奥尔特云中的小天体被摄动进入内太阳系的产物。小行星是在太阳系形成初期大融合过程中的半成品,火星和木星之间形成的小行星带可能是由木星引力作用所致。
奥斯特云有多大,哪柯依伯节带有多大?
必须强调,这两者是人为定义的,而且边界是模糊的,柯伊伯带一般认为是距离太阳50-几百天文单位,奥尔特云距离大约在几万天文单位(大约一光年)。本回答被网友采纳
第4个回答 2012-04-01
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