They can also be made sterile, which germ-infested humans, who risk spreading disease around the solar system, cannot.

它们还能无菌地工作，而携带有细菌的人类有可能会在太阳系传播疾病，故无法做到这一点。

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The two spacecraft are the most distant human-made objects, out at the edge of the heliosphere — the bubble the sun creates around the solar system.

这两艘飞船是目前距离最遥远的人造物体，远在日光层外缘——由太阳产生的，环绕太阳系的巨型泡状体。

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This technology has been pushed by some scientists as an alternative means of travelling around the solar system instead of conventional chemical fuels.

这项技术作为化学燃料的替代而广受科学家推崇。

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NASA hopes that Dawn's year long orbit around Vesta will help scientists learn more about the development of the solar system, and how asteroids and other space objects were created.

VOA: special.2011.07.27

Ikaros will demonstrate the principle of solar sailing, which has long been touted as a means of moving spacecraft around the Solar System.

BBC: Mini-camera pictures Japan's Ikaros solar sail

By using lasers, NASA is now on the verge of revolutionizing and speeding up delivery of data now dispatched from outer space and all around the solar system, the agency said.

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Without it such a galaxy's outer parts would spin more slowly than the inner ones (just as the outer planets of the solar system move around the sun more slowly than the earth does).

ECONOMIST: The galactic gourmand