Until recently, scientists believed that life on other planet was just a hopeful dream.

直到最近，科学家们还认为其他星球上的生命只是一个充满希望的梦。

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As for the "new" in new American dream, we help people live the dream, but in a way that ensures a livable planet for current and future generations.

为了体现新美国梦的“新”，我们帮助人们经营着那个梦，但是有一点会保证，那就是给当下这一代和下一代一个生机勃勃的地球，一个适合人类居住的地球。

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All of this is good news for astrobiologists who dream of finding life beyond Earth's confines, as many of the extreme environments on our planet are thought to be the norm for other worlds.

对于梦想在不同于地球环境的星球上找到生命的星际生物学家(astrobiologists)来说，这些都是好消息，因为人们认为地球上的大多数极端环境在其它星球上都是正常环境。

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And, for those space-cadets who still dream of a manned mission to the planet, there is also the Mars radiation environment experiment.

ECONOMIST: Mars Odyssey

Lim admits that the recent loss of both the Mars Polar Lander and Mars Climate Orbiter may have affected favourable public opinion, which is what the project needs most if the dream of seeing astronauts on the Red Planet is ever to be realised.

BBC: Destination Mars on Earth

It was the realization of a dream for a player which had begun life with one simple dream -- to become one of the best striker's on the planet.

CNN: Falcao: Soccer's 'Tiger' prowls for goals