21-centimeter radiation observations of the galaxy reveal a.the location of neutral hydrogen clouds. b.the location of population II stars. c.the location of population I stars. d.the location of the galactic corona. e.the location of white dwarfs.

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	a.	the location of neutral hydrogen clouds.
	b.	the location of population II stars.
	c.	the location of population I stars.
	d.	the location of the galactic corona.
	e.	the location of white dwarfs.

21-centimeter radiation observations of the galaxy reveal a. the location of neutral hydrogen clouds. b. the location of population II stars. c. the location of population I stars. d. the location of the galactic corona. e. the location of white dwarfs.