A little over 50 years after the first aeroplane new，Yuri Gagarin be-came the first human in space.The“space race”of the 1960s and 1970ssaw huge advances in technology that enabled people to go to space for thefirst time and then land on the moon．No one has been back to the moonsince 1972．However，America has announced(宣告，公諸于眾)plans toreturn，as well as a manned mission to Mars.The Europcan Space Agencyis heavily involved in the building and maimaining 0f the new IntematlonalSpace Station，due for completion in 2010．Could you imagine where wellbe in another 50 years?