The spectra of the coolest stars contain strong absorption features (or lines) of

Name: The spectra of the coolest stars contain strong absorption features (or lines) of
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The presence of TiO molecules in the atmosphere of cool stars leads to the absorption of light at specific wavelengths, resulting in strong absorption features in their spectra. Ionized helium, helium, and hydrogen are also present in the spectra of these stars, but the absorption features of TiO are the most prominent.

The Spectra of the Coolest Stars Contain Strong Absorption Features