1 What properties of a star are needed to calculate the star's luminosity?
A. Size and apparent brightness
B. mass and distance to the star.
C. temperature and diameter of the star
D. apparent brightness and distance to the star.
2. Which cool and bright stars are located in the upper right of the H-R diagram?
A. red giants
B. neutron stars
C. white dwarfs
D. main sequence
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