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doit_the_clown doit_the_clown
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7 years ago
The spectrum of a BL Lacertae object shows
A)   strong, highly redshifted emission lines.
B)   doubled emission lines split by the Doppler shift from oppositely directed jets of material.
C)   absorption lines of highly ionized atoms.
D)   a smooth continuum with no recognizable features.
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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
Good timing, thanks!
fxinternational
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Yesterday
Brilliant ツ
Fanmkreyol
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2 hours ago
Correct Slight Smile TY
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