Question

what type of galaxy the is composed of a mixture of young and mature stars; these stars orbit an elliptical (or barred) central bulge (comprised of a super massive black hole) which has on-going star formation in arced arms that extend from it.

Answer 1

The type of galaxy the is composed of a mixture of young and mature stars; these stars orbit an elliptical (or barred) central bulge (comprised of a super massive black hole) which has on-going star formation in arced arms that extend from it is called elliptical galaxies.

Answer 2

Elliptical galaxy

Elliptical galaxies are egg-shaped, composed of older, low-mass stars and because of the lack of star-making gas and dust clouds, little stars formation are occurring in them. Every elliptical are comprised of a central supermassive black hole that is related to the mass of the galaxy itself. Messier 87 is an example of the elliptical galaxy.