Older elliptical galaxies, which lack star formation regions, often appear this color.
Older elliptical galaxies, which lack star formation regions, often appear this color. When something falls into a black hole, it will spaghettify and turn this color. Stars of this color are often of spectral type M and appear at the right side of the Hertzsprung-Russell diagram; examples of such stars include Betelgeuse. The distance to an object moving (*) away from the observer can be measured by looking at how its spectral lines have been altered due to an effect named after this color. In that effect, the object turns this color because light waves stretch according to the Doppler effect. For 10 points, identify this color with wavelength around 650 nm, the longest in the visible spectrum.
Older elliptical galaxies, which lack star formation regions, often appear this color.
red