2 The range of stellar surface temperatures spans about a factor of ___ . A 504 B 2 C 100 4 Main sequence stars can be A cool and very large in size….

2 The range of stellar surface temperatures spans about a factor of ___ .

A 504

B 2

C 100

4 Main sequence stars can be

A cool and very large in size.

B hot and intrinsically highly luminous

C hot and intrinsically dim

D cool and intrinsically highly luminous

5 The vertical axis of the Hertzsprung-Russell Diagram measures

A how much light leaves a star’s surface.

B how hot the core of the star is.

C the radius of a star.

D the color of a star.

11 Spectral classes first organized the characteristics of stars according to

A hydrogen absorption features in the spectrum.

B iron absorption features in the spectrum.

C stellar size.

D stellar mass.