NASA's Kuiper Airborne Observatory and SOFIA Are Two Examples of Telescopes

Multiple Choice

NASA's Kuiper Airborne Observatory and SOFIA are two examples of telescopes placed in high-flying aircraft. Why would astronomers put telescopes in airplanes?

A) to get the telescopes closer to the stars
B) to get the telescopes away from the light-pollution of cities
C) to get the telescopes above the majority of the water vapor in the earth's atmosphere
D) to be able to observe one object for more than 24 hours without stopping.
E) to allow the telescopes to observe the full spectrum of light