Radio maps of the spiral arms of our galaxy
A)reveal that our galaxy is a grand design spiral.
B)map the location of hot O and B stars by the radio radiation they emit.
C)reveal that the spiral arms are winding up and growing closer together.
D)reveal that the Sun is currently located in the center of a spiral arm.
E)map the location of dense neutral hydrogen clouds.

Question

Quizplus · Accepted Answer

Radio maps of the spiral arms of our galaxy map the location of dense neutral hydrogen clouds. This is done by detecting the 21 cm emission line of hydrogen gas. These maps reveal the structure of the spiral arms and allow astronomers to study the dynamics of the Milky Way.

Radio Maps of the Spiral Arms of Our Galaxy