Quasars are the highly energetic cores of distant galaxies.
是遥远系的极为活跃的核心。
Quasars are the highly energetic cores of distant galaxies.
是遥远系的极为活跃的核心。
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8.8万美元的光谱仪,用于探测来自遥远的微弱光线。
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