Question

universe

1. all of the stars contain helium and _______________.

a.methane b. ammonia c. hydrogen d. oxygen

1. blue stars are the _______________ stars.

a.coolest b.hottest c. biggest d. smallest

1. compare and contrast what would happen if 2 galaxies collide: _______________

Explanation:

For question 22, hydrogen and helium are the most abundant elements in stars. For question 23, blue - stars have high surface temperatures. For question 24, when two galaxies collide, stars rarely collide directly, but gas clouds can interact, triggering star formation, and the overall structure of the galaxies can be distorted.

Answer:

1. c. Hydrogen
2. b. Hottest
3. Stars rarely collide directly, gas clouds interact triggering star - formation, and galaxy structures can be distorted.