need help with 3 of my astronomy homework questions:
Suppose you take a spectrum of light coming from a planet that looks blue to the eye. Is the visible light emitted by the planet, reflected by the planet, or both? Which (if any) portions of the visible light spectrum do you expect to find “missing” in the planet’s spectrum? Explain your answers.
To maximize sensitivity, CCD cameras must be kept cold. Why would a hot CCD chip give a brighter background? (Hint: when atoms are hotter, there is a higher probability that an electron might escape from the atom on its own).
Sample return missions have conducted sample return missions to comets and asteroids. Scientists are also working on a Mars sample return mission but that is some years off. Why is returning a sample from Mars more difficult than returning one from a comet?
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