An aurora borealis (similar to the northern lights) takes place in the upper atmosphere of the polar regions of the earth. The following spectrum was observed when light from the upper atmosphere during the aurora borealis was analyzed. This spectrum was then compared with spectra from three gases. Unknown planet Gas 1 Gas 2 Gas 3

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Q: Hertzsprung-Russell Diagram

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.