３０年前 ,当３名宇航员乘坐阿波罗１１号宇宙飞船实现具有历史意义的登月之旅时 ,２０多米高的运载火箭共携带了２５００吨燃料。为了摆脱庞大的运载工具 ,长期以来 ,人们一直设想开发一种以阳光为能源的光帆航天器。本世纪初 ,几位科学幻想小说家曾写过有关用反射镜面推动宇 Thirty years ago, when three astronauts took the historic moon trip to the spacecraft Apollo 11, more than 20-meter high launch vehicles carried 2,500 tons of fuel. In order to get rid of the huge delivery vehicles, people have long been envisioned to develop a light-sailed spacecraft powered by the sun. At the beginning of this century, several sci-fi writers had written about using mirrors to promote Yu