![Dr J talking about the importance of spectroscopy (artist’s impression)](https://cdn.eso.org/images/thumb300y/eso50_ch6_07.jpg)
Dr J talking about the importance of spectroscopy (artist’s impression)
![Dr J talking about the visible light spectrum](https://cdn.eso.org/images/thumb300y/eso50_ch4_02.jpg)
Dr J talking about the visible light spectrum
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