比尔和他的团队使用一种被称为“活动镜”的光学仪器，这是一种在天文望远镜的种类中用来发现新出现的恒星和遥远星系的仪器。
Bille and his team work with an optical instrument called an active mirror—a device used in astronomical telescopes to spot newly emerging stars and far distant galaxies.
在光学天文学中，在用望远镜观察恒星时，我们依靠的是可见光波。
In optical astronomy, using a telescope and observing the stars that way, we rely on visible light waves.
尘埃温度远不及恒星，所以光学望远镜难以观测到。
Dust is nowhere near as hot as a star, therefore optical telescopes cannot observe it.
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