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The evolution of a protostar slows significantly as it approaches the main sequence.
Q1: Interstellar absorption lines are narrow primarily because:<br>A)there
Q26: What event marks the birth of a
Q30: What kind of variable stars are pre-Main
Q39: In which wavelengths have the births of
Q50: The longest stage in the life cycle
Q56: Which of these events is NOT possible?<br>A)low-mass
Q95: At what stage of evolution do T
Q100: How are Cepheids and RR Lyrae stars
Q102: The vast majority of pulsars are known
Q128: From the perspective of an observer in