1. What are NASA’s four Great Observatories, and in what parts of the electromagnetic spectrum do (or did) they observe?
2. Why did Rømer’s observations of the eclipses of Jupiter’s moons support the heliocentric, but not the geocentric, cosmogony?
3. Advertisements for home telescopes frequently give a magnification for the instrument. Is this a good criterion for evaluating such telescopes? Explain your answer.
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