An astronomer studying a galaxy finds that its spectrum shows only old,low-mass,Population II stars,and photographs of the galaxy show little or no interstellar gas or dust.What kind of galaxy is this astronomer studying?

Question

Quizplus · Accepted Answer

The presence of only old, low-mass Population II stars and little to no interstellar gas or dust suggest that this galaxy has been around for a long time and has already used up much of its gas and dust reservoir. Elliptical galaxies are known for having mostly older stars and very little interstellar gas and dust, making them the best choice for this scenario.

An Astronomer Studying a Galaxy Finds That Its Spectrum Shows