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独门绝技二:灵活自如的巨眼
根据FAST的工作原理,当它观测天体时,会随着天体的方位变化,在其500米的球冠状主动反射面上实时形成一个300米直径的瞬时抛物面,并通过这个300米的抛物面来汇聚电磁波。
形象地来说,如果把FAST比作一只巨大的眼睛,那么这只巨眼的眼球直径就有500米,而负责接收光线的眼珠直径就有300米。FAST就是靠这个巨大灵活的眼珠来汇聚电磁波、观测深空。
独门绝技三:毫米精度
FAST的设计目标,是把覆盖30个足球场的信号,聚集在药片大小的空间里,否则,就无法监听到宇宙中微弱的射电信号。500米的结构,处处都是头发丝般毫米级的精度要求。用来编织索网的7000多根手臂般粗细的钢缆,每一根的加工精度都被控制在一毫米以内;最终的500米口径的天线精度是三个毫米,每一块小面板的制造精度是1.5个毫米。
深空猎手 可以搜索外星生命
还不止这些,FAST还是深空猎手,能探测到宇宙的边缘,首先,FAST能够冲出银河系,寻找新星,特别是快速旋转、密度极高的脉冲星,FAST还可能观察到早期宇宙的蛛丝马迹——中性氢云团的运动,掌握星系之间互动的细节,揭秘宇宙的起源和演化。此外,FAST还能监听到一些太空有机分子发出的独特电磁波,搜索可能的星际通讯信号和外星生命。也就是说,我们的“中国天眼”有的能还会寻找到“外星人”!
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