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staedtler staedtler
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7 years ago
The presence of a very large amount of unseen (“dark”) matter in the halo of our Galaxy is deduced from
A)   the rotation curve of our Galaxy, in which orbital speeds of stars appear to obey Kepler's law.
B)   the rotation curve of our Galaxy, in which orbital speeds of stars in the outer regions of the Galaxy are significantly higher than is predicted by Kepler's law in which the value for the observed mass in the Galaxy is used.
C)   the unexpected absence of luminous matter (stars, etc.) beyond a certain distance from the galactic center.
D)   the high amount of interstellar absorption in certain directions.
Textbook 
Discovering the Universe

Discovering the Universe


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

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