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doit_the_clown doit_the_clown
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7 years ago
How was the mass of the candidate black hole at the center of the galaxy M87 estimated?
A)   From the amount of mass that is disappearing into it every year
B)   From the periodic shift in the wavelengths of spectral lines from a companion object around which the black hole is orbiting
C)   From observations of the very high orbital speed of objects close to this center
D)   From the intensity of X rays from it and the frequency of flickering of the X-ray intensity
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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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discovererdiscoverer
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7 years ago
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doit_the_clown Author
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7 years ago
Helped a lot
jbarnett14
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Yesterday
Thank you, thank you, thank you!
nicolepope23
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2 hours ago
Smart ... Thanks!
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