at sea level in outer space on mountain tops at higher latitudes
I gave my students this multiple choice question: Some scientists study images of very distant celestial bodies. Where is the best location for the types of telescopes that can provide the scientists with the clearest images.

Only one answer is correct among these 4 choices:
- at sea level
- in outer space
- on mountain tops
- at higher latitudes

Could you tell me which one is correct?

in outer space