Spacewalking astronauts installed an 88-million-dollar spectrograph designed to detect faint light from faraway quasar .
太空漫步宇航员安装8.8千万美元的谱仪,用于探测来自遥远星体的线。
Spacewalking astronauts installed an 88-million-dollar spectrograph designed to detect faint light from faraway quasar .
太空漫步宇航员安装8.8千万美元的谱仪,用于探测来自遥远星体的线。
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