2009年9月21日中午,一架改装的波音747客机背着“发现”号航天飞机降落在美国宇航局肯尼迪航天中心,结束了为期两天的“回家之旅”。“发现”号航天飞机于2009年8月28日发射升空,共将7名宇航员和约8吨重的货物、科学设备等补给送入国际 At noon on September 21, 2009, a modified Boeing 747 aircraft landed on NASA’s Kennedy Space Center carrying the space shuttle Discovery and ended a two-day “return trip.” The Space Shuttle Discovery No. 1 was launched on August 28, 2009, bringing a total of seven astronauts and about 8 tons of cargo, scientific equipment and other supplies to the International