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What is the term for a collection of 10⁵ to 10⁶ old stars in a region 30 to 100 light-years in diameter?
Q5: What is a similarity between radio and
Q24: The Doppler effect means that the motion
Q33: What evidence do we have that pulsars
Q37: Which of the following types of light
Q58: What principle explains why matter flowing from
Q71: Which property of a telescope determines its
Q85: Which of the following types of light
Q99: The _ shows that sunspots are associated
Q106: What is the lowest energy level in
Q122: What is located between the lobes of