-In which direction is the above spiral galaxy rotating and which color best represents where the gas is being compressed by the spiral density wave
A)clockwise, blue
B)counter-clockwise, pink
C)clockwise, pink
D)counter-clockwise, blue

Question

-In which direction is the above spiral galaxy rotating and which color best represents where the gas is being compressed by the spiral density wave 
A)clockwise, blue 
B)counter-clockwise, pink 
C)clockwise, pink 
D)counter-clockwise, blue

Quizplus · Accepted Answer

The spiral galaxy is rotating counter-clockwise, and the pink color best represents areas where gas is being compressed by the spiral density wave, leading to star formation.

-In Which Direction Is the Above Spiral Galaxy Rotating and Which