Back to Light and Stellar SpectroscopyLesson 24 of 30
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Light and Stellar SpectroscopyModule 5Read Worlds and Galaxies
Module 5 / Lesson 24 of 3045 min
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Whose Voice Is an Integrated Galaxy Spectrum?

When a telescope cannot separate billions of stars, gas clouds, and dust lanes, whose physics appears in the one measured spectrum?

Decompose continuum, absorption, emission, dust attenuation, and velocity broadening without turning a mixed spectrum into one average star.

Light from old golden stars, blue spiral arms, red nebulae, and dark dust lanes converges from one galaxy into one spectrum.
Vastward artistic reconstruction. The converging rays represent integrated light; the galaxy and spectrum are not one calibrated observation.

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