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17. the hertzsprung-russell diagram below shows how the sun is classified among the stars. a star that is several thousand times brighter than the sun with a temperature lower than 4,000 k would be classified as *

a main-sequence star in spectral class b
a supergiant in spectral class k
a main-sequence star in spectral class k or m
a white dwarf in spectral class b
18. two stars are identified on the hertzsprung-russell diagram. based on the diagram below, how do the characteristics of star 1 and star 2 compare? *

star 1 is cooler and less bright than star 2.
star 1 is hotter and brighter than star 2.
star 1 is cooler and brighter than star 2.
star 1 is hotter and less bright than star 2.
19. a hertzsprung-russell diagram is shown below. based on this diagram, which type of stars would belong to spectral class m and have the highest luminosity? *

white dwarfs
main-sequence stars
giants
supergiants

20. barnard’s star is about 5.9 light-years from the sun. the star has an approximate temperature of 2,800 k. based on the diagram below, what spectral class does barnard’s star belong to? *

spectral class o
spectral class b
spectral class a
spectral class m