Approximately __________ of spiral galaxies are barred.
A) 10 percent
B) 25 percent
C) 50 percent
D) 75 percent

Question

Approximately __________ of spiral galaxies are barred. 
A) 10 percent 
B) 25 percent 
C) 50 percent 
D) 75 percent

Quizplus · Accepted Answer

Studies have shown that about 50 percent of all spiral galaxies have a central bar structure. This bar is a dense concentration of stars, gas, and dust found in the center of the galaxy, which rotates separately from the rest of the galaxy. It has been observed that barred galaxies tend to have more active star formation and more chaotic orbits of their stars and gas than non-barred galaxies.

Approximately __________ of Spiral Galaxies Are Barred