Why Does a Star Produce a Full, Continuous Rainbow?

If light keeps interacting inside a star, why does a spectrograph finally reveal a nearly unbroken rainbow?

Start with a familiar glowing object, follow light out of a star, and unfold it into a continuous spectrum.

Unresolved starlight enters a spectrograph before spreading into a smooth continuous spectrum on a detector. — Vastward artistic reconstruction. Colour separation is shown only after the instrument; quantitative meaning comes from calibrated measurements.

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