Tag Archives: cosmic gas

How do astronomers know what elements are stars made of?

Michel van Biezen, from iLectureOnline, explains how do astronomers know what elements are in the atmospheres of exoplanets or in the atmospheres of stars. It all has to do with emission spectra and absorption spectrum. Basically, a heated and ionized gas will output light in certain wavelengths and that is called the emission spectrum. The […]

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