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doit_the_clown doit_the_clown
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7 years ago
Much of the mass of our Galaxy appears to be in the form of “dark” matter of unknown composition. At present, this matter can be detected only because
A)   it emits synchrotron radiation at radio wavelengths.
B)   its gravitational pull affects orbital motions in the Galaxy.
C)   it bends light from distant quasars.
D)   it blocks out the light from distant stars in the plane of our Galaxy.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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papachulopapachulo
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7 years ago
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doit_the_clown Author
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7 years ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
Evolution
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Yesterday
You make an excellent tutor!
missnoname
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2 hours ago
Just got PERFECT on my quiz
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