Despite fears that mysterious floating debris may have damaged the exterior of the space shuttle Atlantis, the craft touched down early Thursday in what officials are calling a by-the-books landing.

• 尽管害怕那个神秘的漂浮碎片可能已经损坏了宇航飞船亚特兰帝斯号的外壳，飞行器还是在星期四早上降落了，官方将其称为一次教科书般的着陆。