Because galaxies and center go together, I would change that to:
While all large galaxies are assumed to have black holes at their centers, not all of those black holes produce quasars.
More SpeedEditor blog entries
Blog entries on The Auto Racing Journal:
(a book of great stories about the Intimidator)
(the book of great NASCAR stories)
More blog entries by Tom Gillispie
Anecdotes by Tom Gillispie
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