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木星及其卫星

星是太阳系中第五颗行星，也是最大的一个，丘比特星的重量比太阳系中所有行星的总质量和打两个倍以上。它是地求的318倍它距离太阳轨道长778,330,000公里，半径：142,984公里，质量1.9X1027公斤。

木星是在天空中的第四亮的行星，仅次于太阳、月亮及金星。它早在史前就为人所知了。一直到了1973年，航天飞机pioneer10成为史上第一个到达木星的航天飞机，之后pioneer11、VOyager1、VOyage2和UIysses野陆续的到达了，所有现在我们才能有这么多有关木星的信息。

木星是一颗气态的行星，它没有液态的表面，而我们平常看到的只是它表面的云层。木星大约由90%的氢及10%的氦组成，上面没有甲烷、水、氨及石头的迹象。它这样的组成构造和太阳星云solarNebulA.很相似（太阳星云是组成我们整个太阳系的原始物体），而土星的构造也有着相似的情形。

再说说木星的卫星，目前为止，我们已知道的卫星数有十一颗，下面是这些卫星的简介：

卫星与木星的距离

（km）

半径（km）质量（kg）

Metis 128 20 9.56X1016

Adrnstea 129 10 1.91x1016

Amalther 181 98 7.17x1018

Theba 222 50 7.77X1017

Io 422 1815 8.94X1022

Europa 671 1569 4.80X1022

Ganymede 1070 2631 1.48x1023

Callisto 1883 2400 1.08X1023

Leda 11094 8 5.68x1015

Himalia 11480 93 9.56X1018

Lysithea 11720 18 7.77X1016

Elara 11737 38 7.77X1017

Ananke 21200 15 3.82x1016

Garme 22600 20 9.56X1016

Sinope 23700 18 7.77X1016 木

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