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staedtler staedtler
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7 years ago
The spiral-arm structure of the Milky Way Galaxy has been measured and evaluated most effectively by observations of
A)   globular clusters in the halo of the Galaxy.
B)   Balmer emission lines of visible radiation from hydrogen.
C)   21-cm radiation from interstellar hydrogen and the distribution of young stars.
D)   Lyman UV radiation from hot hydrogen gas.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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hyponoticahyponotica
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staedtler Author
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7 years ago
Person Raising Both Hands in Celebration

Correct Slight Smile
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