Roughly what percentage of the total mass of a galaxy is made up of luminous, or normal, matter?
A) 5-10 percent
B) 25-30 percent
C) 40-50 percent
D) 70-75 percent
E) 90-95 percent

Question

Quizplus · Accepted Answer

Luminous or normal matter, which includes stars, planets, and interstellar gas, makes up about 5-10 percent of a galaxy's total mass. The rest is primarily dark matter.

Roughly What Percentage of the Total Mass of a Galaxy