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Why are interstellar absorption lines so narrow compared to the width of lines which originate in the photopsheres of stars?
Q3: One solar mass stars produce their energy
Q5: The resolution of Olbers paradox suggests that
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Q36: Compared with the spectral lines in the
Q57: Molecular clouds can be observed<br>A) using infrared
Q63: Some massive stars only live a few
Q77: What is the total mass of a
Q97: Stars with masses between 0.4 <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8656/.jpg"
Q111: What is the Babcock model?
Q129: The Milky Way galaxy is not a