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The luminosity class is assigned to a star by studying the absorption lines in the spectrum of the star.
Q2: Supernovae are the main source of _
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Q20: Describe the concept of a "birth line"
Q27: Refracting telescopes use a mirror to gather
Q31: How do low mass stars in the
Q31: Explain why Copernicus' hypothesis, where the Sun
Q38: According to the theory of general relativity,
Q46: Between now and 2024, in which year
Q47: Spring tides occur at _.<br>A) new moon
Q61: Galileo's book Dialogo strongly defended the work