The development of such a telescope will be one of the greatastronomical projects of the twenty-first century.

　　It is impossible to look for life on another planet using earth-based telescopes. Ourown warm atmosphere and the heat generated by the telescope would make itimpossible to detect objects as small as planets.

　　13.The development of such a telescope will be one of the great astronomical projectsof the twenty-first century.

　　而开发这样一台望远镜将会是21世纪天文学的一个重要的研究课题。

　　语言点:sth.will be one of the great projects of的意思是“某事将成为…的重要研究课题之一。”

　　14.It is impossible to look for life on another planet using earth-based telescopes.

　　使用放置在地球上的望远镜是无法观察到其他行星的生命的。

　　语言点:句子结构分析:it is impossible to do这个结构已成为一个较为固定的it作形式主语的表达方式，通常放在句首。

　　15.Our own warm atmosphere and the heat generated by the telescope would make itimpossible to detect objects as small as planets.

　　地球周围温暖的大气层和望远镜散出的热量使得我们根本不可能找到比行星更小的物体。