What observational evidence supports the hypothesis that elliptical galaxies are born from relatively dense protogalactic clouds?
A) Elliptical galaxies have stars packed more densely together than spiral galaxies.
B) Elliptical galaxies are generally larger than spiral galaxies.
C) Even very distant elliptical galaxies tend to lack young, blue stars, indicating their stars formed early and rapidly.
D) Elliptical galaxies have more and denser gas than spiral galaxies.
E) The stars in elliptical galaxies are denser than those in spiral galaxies.
C) Even very distant elliptical galaxies tend to lack young, blue stars, indicating their stars formed early and rapidly.
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