宇宙有多大?黑洞是什么?昨天，史家小学星期六课程正式开班。总装备部工程设计研究总院科技信息中心主任郭凯为小学生带来了一堂特别的航天课。从运载火箭到太空生活，小学生们个个听得都非常兴奋。一位同学说：神舟飞船与天宫一号对接相当于百米之外穿针引线，太奇妙了!
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