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Home Q & A Board Science-Related Homework Help Physics
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doit_the_clown doit_the_clown
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7 years ago
Which type of observation demonstrates that quasars are relatively small in physical extent?

(a)   Their rapid fluctuation in brightness, often in times as short as hours
(b)   The very small size of their image on Hubble Space Telescope photographs
(c)   The very narrow line widths of emission lines in their spectra
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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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hyponoticahyponotica
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7 years ago
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doit_the_clown Author
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7 years ago
Brilliant ツ
joyceess
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Yesterday
You make an excellent tutor!
choih94
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2 hours ago
Smart ... Thanks!
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