Astronomers are examining stars in our galaxy and are wondering if they make a sound. The astronomers know that space is a vacuum and sound will not travel far in space, but are wondering if the stars themselves are capable of producing sound. Which two questions should the astronomers investigate to help determine if stars make a sound? 1. Are stars made of matter?

2. Does the matter inside stars collide?

3. Are stars transparent or translucent?

4. Do stars convert thermal energy into light energy?

5. Do stars reflect waves?

Which statements help to support your selections above?

6. Reflection is a property of light waves, so if stars reflect waves then they are only capable of producing light waves.

7. If stars convert thermal energy into light energy, then there won’t be any energy available to produce sound waves.

8. Collisions are one way to convert mechanical energy into sound energy, if the matter within them collides, sound waves could be produced.

9. Sound waves require matter to be transmitted, if stars are made of matter then they can transmit sound waves.

Select which combination best represents your thinking.

A.
1 and 9 & 5 and 6

B.
3 and 9 & 4 and 7

C.
1 and 9 & 2 and 8

D.
4 and 7 & 5 and 6