When the spectrum of a particular star is photographed and analyzed, it is found that the spectrum contains absorption bands of the metal hydrides methane (CH₄) and ammonia (NH₃). Based on this information, the star is:

Question

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The presence of metal hydrides such as methane (CH4) and ammonia (NH3) in the spectrum of a star indicates that it is very cool. These molecules are typically found in the atmospheres of brown dwarfs, which are cooler than the coolest M-type stars. Brown dwarfs are objects that are too massive to be planets but not massive enough to sustain hydrogen fusion reactions in their cores, which is the process that powers true stars.

When the Spectrum of a Particular Star Is Photographed and Analyzed