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doit_the_clown doit_the_clown
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7 years ago
The fact that quasars can be detected from distances from which even the biggest and most luminous galaxies cannot be seen means that
A)   they must be in directions where gravitational focusing by the masses of nearer galaxies makes them visible from the Earth.
B)   they must be far more luminous than the brightest galaxies.
C)   they must be in directions where intergalactic absorption by dark matter is minimum, allowing us to see them.
D)   their spectra have not been as redshifted by their motion as those of galaxies, and hence they can still be seen.
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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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doit_the_clown Author
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7 years ago
This site is awesome
big_larry_samp
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Thank you, thank you, thank you!
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Good timing, thanks!
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