The Hertzsprung-Russell Diagram is a plot for stars using absolute magnitude versus temperature.
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Q11: The formula Q12: If a star has an apparent magnitude Q13: Recently discovered brown dwarfs have spectra similar Q14: The luminosity class is assigned to a Q15: S tars of low luminosity will always Q17: The spectral classification of stars started with Q18: A star's apparent magnitude is a measure Q19: If two stars are emitting the same Q20: Recent discoveries of two types of brown Q21: How do astronomers determine the distance to
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