Infrared observations are used to determine the mass of asteroids because ________.
A. most asteroids are made of dark minerals which are more efficient at reflecting infrared light than visible light
B. the Hubble Space Telescope only has infrared cameras
C. the infrared radiation is the glow of heat from the asteroid, and larger asteroids emit more infrared light
D. asteroids reflect too little visible light to use optical telescopes for the measurements
Answer: C
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