Discovered more than a century ago, the electromagnetic spectrum is the basis on which our universe operates. Without it we wouldn’t be able to see, stars wouldn’t shine, and life would not exist.

THE absorption spectrum of benzoquinone in the vapour state between 0° C. and 100° C. in cells 5–100 cm. long has been photographed with a three-prism Steinheil glass spectrograph and a Hilger ...

Here we report ground-based observations of the dayside emission spectrum for HD 189733b between 2.0–2.4 μm and 3.1–4.1 μm, where we find a bright emission feature.

For the first time, researchers in Europe have witnessed Mars’ green night sky in the visible light spectrum, further confirming a decades-old suspicion about the Red Planet’s eerie atmosphere.