Which of the following analogies best describes how the structure of the galaxy's spiral arms is maintained?
A. Like military jets flying in formation above a football stadium, the stars in the spiral arms keep a spiral-shaped formation as they orbit the galaxy.
B. Like cars slowing in traffic to look at an accident, stars slow as they pass through the spiral arms.
C. Like a coiling rope, the spiral arms wind up tighter with every galactic rotation.
D. Like the fins of a giant pinwheel toy, the spiral arms carry a set of bright stars around as they sweep through the galaxy.
Answer:B
Which of the following analogies best describes how the structure of the galaxy's spiral arms is maintained?
A. Like military jets flying in formation above a football stadium, the stars in the spiral arms keep a spiral-shaped formation as they orbit the galaxy. B. Like cars slowing in traffic to look at an accident, stars slow as they pass through the spiral arms. C. Like a coiling rope, the spiral arms wind up tighter with every galactic rotation. D. Like the fins of a giant pinwheel toy, the spiral arms carry a set of bright stars around as they sweep through the galaxy.