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2009年3月开普勒太空望远镜送入了《环日轨道》避免地球遮挡视线
以便观测银河系深处时不被地球遮挡视线.
宇宙科普小片42/55
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App04:42以便观测银河系深处时不被地球遮挡视线.
App02:00App01:18App01:21App03:18App02:37App02:00App03:42App02:14App03:56App03:51App03:51App02:43App02:02App01:58App04:42
