According to the density wave theory, a gas cloud forms new stars as it passes through a spiral arm because:
A. it slows down and compresses.
B. it gathers more interstellar material.
C. it will collide with dark matter.
D. its metals will break down into non-metals.
Answer:A
According to the density wave theory, a gas cloud forms new stars as it passes through a spiral arm because:
A. it slows down and compresses. B. it gathers more interstellar material. C. it will collide with dark matter. D. its metals will break down into non-metals.