搜索结果: 1-1 共查到“天文学 dream”相关记录1条 . 查询时间(0.062 秒)
![](http://www.firstlight.cn/upload/imgfile/201011/30/2010113017441.jpg)
Higher levels of space radiation between 2020 and 2040 could endanger US President Barack Obama's vision for a manned mission to Mars, according to a NASA scientist. The result of two separate solar-a...