Question

the thick distribution of hot gasses and stars surrounding the center of a galaxy is called the galactic ________.

nebula
bulge
disk
ring
halo

Explanation:

A nebula is a cloud of gas and dust in space. A galactic bulge is a thick distribution of stars and gas around the center of a galaxy. A galactic disk is a relatively thin, rotating structure. A ring is a circular structure. A galactic halo is a spherical region surrounding a galaxy. Based on the description of "thick distribution of hot gasses and stars surrounding the center of a galaxy", the correct term is bulge.

Answer:

bulge