Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: The sun is considered the center of the solar system.

A: What is considered the center of the solar system?
****
Q: Constructive interference is when two waves combine to create a larger wave.

A: What is it called when two waves combine to create a larger wave?
****
Q: Besides the inner membrane, the matrix are many respiratory enzymes found.

A:
Besides the inner membrane, where are many respiratory enzymes found?
****