What do radio maps of the spiral arms of our galaxy show?
A)They reveal that our galaxy is a grand design spiral.
B)They map the location of dense neutral hydrogen clouds.
C)They reveal that the Sun is currently located in the centre of a spiral arm.
D)They map the location of hot O and B stars by the radio radiation they emit.

Question

Quizplus · Accepted Answer

Radio maps of the spiral arms of our galaxy show the location of dense neutral hydrogen clouds, which emit radio waves that can be detected by radio telescopes. These maps have been used to create a detailed picture of the structure of our galaxy and the location of its spiral arms.

What Do Radio Maps of the Spiral Arms of Our