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Spectrum analysis
2
Barium--Spectra
1
Chemistry
1
Color vision
1
Colors
1
Deep space--Andromeda Galaxy
1
Electromagnetic waves
1
Hydrogen--Spectra
1
Light
1
Music and color
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Nebulae
1
Sodium--Spectra
1
Stars--Spectra
1
Strontium--Spectra
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Sun
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