The Hertzsprung-Russell diagram shows the relationship between a stars:

Most stars, ninety percent, on the Hertzsprung-Russell diagram are:

Main-sequence stars that have the highest temperatures are the:

Main-sequence stars that have the lowest temperatures are the:

The brightness of a main-sequence star is related to its:

How much more massive are the hottest blue stars when compared to our Sun?

How massive are the coolest red stars when compared to our Sun?

The size of red giants can be estimated by comparing them with stars of known size and that have the same:

Any difference in the brightness of two stars having the same surface temperature is due to their relative:

The size of a white dwarf star can be compared to the size of:

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