*ANSWER GETS MEDAL!*
Would it be possible to measure star distances using telescopes in orbit around the Moon and Mars? Why?
A. It would not be possible because the Moon and Mars are too far apart to make accurate measurements
B. It would not be possible because the telescopes would be made differently for their different orbits.
C. It would be possible because Mars and the Moon pass close to each other about once every two years.
D. It would be possible because the distance between the Moon and Mars provides a parallax error that can be used to measure star distances.

Question

*ANSWER GETS MEDAL!*
Would it be possible to measure star distances using telescopes in orbit around the Moon and Mars? Why? 
A. It would not be possible because the Moon and Mars are too far apart to make accurate measurements 
B. It would not be possible because the telescopes would be made differently for their different orbits. 
C. It would be possible because Mars and the Moon pass close to each other about once every two years. 
D. It would be possible because the distance between the Moon and Mars provides a parallax error that can be used to measure star distances.

thomaster · Answer

Not exactly a biology question. I think it would fit better in physics. 
We don't have a section for space science at the moment.