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How can astronomers determine the size of an emission region in a very distant and unresolvable ...

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How can astronomers determine the size of an emission region in a very distant and unresolvable ...

How can astronomers determine the size of an emission region in a very distant and unresolvable source?
A)   By measuring the object's mass and by using a reasonable value for the average density for matter to calculate its volume and hence its diameter.
B)   By using radio interferometry since this technique can resolve far greater detail than optical imaging
C)   By measuring brightness variability since an object cannot vary more rapidly than the time taken for light to cross the source
D)   By measuring the redshift of its spectrum, since this will be dependent on the source size

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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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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doit_the_clown Author

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7 years ago

Thank you, thank you, thank you!

GeorgeNeist

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Thanks for your help!!

einstein

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