Discovery & Documentary

生活百科—探测宇宙

Code : 9876543284358


Price :	~~MYR65.00~~ ~~SGD30.88~~ ~~USD25.35~~ ~~RMB175.50~~ MYR52.00 / SGD24.70 / USD20.28 / RMB140.40
Weight :	250 g
Genre :	Animal / Dinosour ,
Discs :	4
Model :	DVD ,
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太阳系（solar system）是由太阳、9颗大行星、66颗卫星以及无数的小行星、彗星及陨星组成的。
行星由太阳起往外的顺序是：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）和冥王星（pluto）。离太阳较近的水星、金星、地球及火星称为类地行星（terrestrial planets）。宇宙飞船对它们都进行了探测，还曾在火星与金星上着陆，获得了重要成果。它们的共同特征是密度大（>3.0克/立方厘米），体积小，自转慢，卫星少，内部成分主要为硅酸盐（silicate），具有固体外壳。离太阳较远的木星、土星、天王星、海王星及冥王星称为类木行星（jovian planets）。宇宙飞船也都对它们进行了探测，但未曾着陆。它们都有很厚的大气圈，其表面特征很难了解，一般推断，它们都具有与类地行星相似的固体内核。在火星与木星之间有100000个以上的小行星（asteroid）（即由岩石组成的不规则的小星体）。推测它们可能是由位置界于火星与木星之间的某一颗行星碎裂而成的，或者是一些未能聚积成为统一行星的石质碎块。陨星存在于行星之间，成分是石质或者铁质。

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