Question

a concentration of older stars that shared a common origin and are held together by gravity, lying within the galactic halo of a spiral galaxy is called a(n) _____.

options:

• galactic nucleus
• absorption nebula
• globular cluster
• emission nebula

Explanation:

• A galactic nucleus is the dense center of a galaxy, not old stars in the halo.
• Absorption nebulae are gas/dust clouds that block light, not star clusters.
• Globular clusters are tight groups of ancient stars with a common origin, bound by gravity, located in galactic halos.
• Emission nebulae are glowing gas clouds where new stars form, not old star concentrations.

Answer:

globular cluster