Question

1. which type of galaxy contains older, reddish stars?

spiral
lenticular
irregular
elliptical

Explanation:

Elliptical galaxies have very little interstellar gas and dust, so they no longer form new, hot blue stars. They are dominated by older, cooler stars that emit reddish light. Spiral galaxies have both old and new stars, lenticular galaxies have a mix but less active star formation than spirals, and irregular galaxies often have active star formation with young blue stars.

Answer:

D. Elliptical