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Q4: Betelgeuse is the bright red star representing
Q16: How do we think the "hot Jupiters"
Q18: Explain why the early Earth did not
Q23: The Ptolemaic model of the solar system
Q27: The two most important processes in heating
Q41: The ultimate source of energy that powers
Q56: Titan's surface may contain lakes of liquid
Q82: A lunar eclipse occurs only when the
Q90: Which in its gaseous form is not
Q134: Which is the densest planet in the