美国空军的 X-37B太空船当时正在环绕地球，在某个官方未公开的轨道执行秘密任务。 天空观察者发现了它。
The US Air Force's X-37B space plane is circling Earth and, although it is on a classified mission with an officially unpublished orbit, sky watchers have spotted it.
在太空中吃饭这一任务到“天空实验室”时有了很大进步。
这次任务同时对天空和地表进行研究，加拿大所制造的仪器所发射的激光可以帮助研究头上方的尘埃和云层。
The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.
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