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【单选题】
下列关于不可见光的说法中，正确的是（ ）。A.
使用高倍望远镜观测
B.
向太空发激光信号，然后通过计算其反射回来的时间来估算
C.
使用特殊的光学望远镜，通过分析到达地球光线的衰变估算出来的
D.
依据宇航员的测算得来的
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A.
older to Younger
B.
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