At the end, the development trend of electric rocket for future solar system exploration mission is pointed out.

最后，指出了空间探测器主推进用电火箭的发展趋势。

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Comparative planetary geology is a frontier discipline on exploring nature and evolution of human being, and a key to reaching the three major goals of Solar system exploration.

比较行星地质学是人类认识自然和人类本身形成与演化的前缘学科，是实现太阳系探测三大科学目标的主要手段。

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IN the summer of 1977 two American spacecraft were launched on what is arguably the grandest mission ever: the exploration of the outer planets of the solar system and the space that lies beyond.

1977年的夏天，两位美国飞行员被选中投身于可以说是有史以来最伟大的使命：对太阳系及更远空间的外太空探索。

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Hydrocarbons, helium, hydrogen, and volatiles in the solar system are important for human exploration and habitation because they will provide essential high-energy, high-density fuels and feedstock for off-world manufactured goods and materials for construction.

FORBES: Move up http://i.forbesimg.com t Move down

Until recently, the asteroids were largely a footnote in NASA's plans for exploration of the solar system.

WSJ: Asteroid Vesta Gets a Close Study

In other words, human exploration of the solar system does not have to be fixed doggedly on the moon first and Mars later.

ECONOMIST: Space