美国“发现”号航天飞机将于5月中旬重返太空,载7名航天员前往国际空间站。这是航天飞机因事故而停飞两年多以来的首次发射。图为“发现”号移往肯尼迪航天中心39B 发射台。新研制的外挂大燃料箱(机身后黄色巨柱)和两个固体火箭推进器(机身两侧白色圆柱)已与航天飞机轨道飞行器 The United States “Discovery ” space shuttle will return to space in mid-May, carrying seven astronauts to the International Space Station. This is the first launch of a space shuttle that has been grounded for more than two years due to an accident. The photo shows the “Discovery ” moved to the Kennedy Space Center 39B launch pad. The newly developed plug-in large fuel tank (yellow pillar behind the fuselage) and two solid rocket propulsion (white cylinder on both sides of the fuselage) has been associated with the space shuttle orbital aircraft