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Home Q & A Board Science-Related Homework Help Physics
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symbo symbo
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7 years ago
What observational fact convinces astronomers that the source of energy in a typical quasar is physically very small?
A)   The rapid variation in the energy output of the source
B)   The extreme distance of all quasars
C)   Their starlike appearance in our sky
D)   The narrowness of the emission lines in their spectra
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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papachulopapachulo
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7 years ago
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symbo Author
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#2
6 years ago
Thanks for answering, I'll share this with my classmates too
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