We might as well give up on optical astronomy and go with radio astronomy.

我们还是可能放弃光学天文学，选择无线电天文学。

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In astronomy, in optical astronomy, we cannot measure the period or the frequency of optical light.

在天文学中，在光学天文学中，我们不能测量周期或者可见光的频率。

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In optical astronomy, using a telescope and observing the stars that way, we rely on visible light waves.

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。

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Todd Boroson and Tod Lauer of the US National Optical Astronomy Observatory analysed some 17, 500 spectra from the Sloan Digital Sky Survey, and have now found just such a pair of emissions coming from a distant quasar.

BBC: Dancing black hole twins spotted

On 17 March 2005, Andrzej Udalski, professor of astronomy at Warsaw University, Poland, and leader of the Optical Gravitational Lensing Experiment (Ogle), noticed that just such an event was about to occur near the centre of our galaxy.

BBC: Artist's concept of a distant world (BBC)