What Is the Main Property of a Main-Sequence Star That

Q19: Examine the figure below.On a typical H-R

Q20: Stars generally exhibit:<br>A) an absorption spectrum.<br>B) a

Q21: If a star's distance is 100 pc,what

Q21: Stars are made mostly of<br>A) helium.<br>B) oxygen.<br>C)

Q22: The spectrum in the figure below is:

Q25: On a typical H-R diagram,where are the

Q26: The luminosity class of a star is

Q27: Star A is a red star.Star B

Q28: Using information from the figure below,explain why

Q54: What is the spectral type of stars