Stars of spectral class A have the most hydrogen whereas stars of spectral class O have the least hydrogen.
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Q1: Spectra of the least massive main-sequence stars
Q9: Mass solely determines the position of a
Q10: Mass determines the position of a star
Q11: A parsec is a unit of time.
Q13: Stars with a higher apparent brightness are
Q15: It is not possible to detect a
Q15: The stars that have the largest radii
Q16: Excluding the Sun,not a single star has
Q18: If a star's measured parallax is 0.2
Q19: Parallax is used to measure
A) distance.
B) velocity.
C)
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