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Q4: The Zeeman effect can be used to
Q12: Young star clusters have bluer turn-off points
Q19: Reflection nebulae look blue because they are
Q25: High temperatures are required to get H
Q29: An apparent westward motion of a planet
Q30: Pre-main sequence stars are above and to
Q42: Compared to the terrestrial planets,Jovian planets<br>A) have
Q46: The youngest stars in the Orion Nebula
Q49: Tides occur because the gravitational force of
Q52: An atom can be ionized by _