Astrophysics (Index)About

red and dead

(description of a galaxy with old stars and no star formation)

The phrase red and dead is used in astronomy to describe galaxies with no (or minimal) star formation or early stars. "Dead" in the sense of not producing stars, and "red" being the color of long-lasting stars. Non-red stars are brighter and shorter-living, disappearing as time passes when star formation is absent. A typical red and dead galaxy is elliptical.

(galaxies,galaxy type)
Further reading:

Referenced by pages:
elliptical galaxy