Simply begin typing or use the editing tools above to add to
this article. Once you are finished and click submit, your
modifications will be sent to our editors for review. The right
answer—accretion by gravity onto supermassive black holes—was
proposed shortly after Schmidt’s discovery independently by
Russian astronomers Yakov Zel’dovich and Igor Novikov and
Austrian American astronomer Edwin Salpeter. The combination of
high luminosities and small sizes was sufficiently unpalatable
to some astronomers that alternative explanations were posited
that... What made you want to look up "Igor Novikov"? Please
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