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This question already has an answer here:

For an observer outside Black hole's event horizon nothing ever falls into the black hole .

So if the observer waits for an eternity outside a super massive blackhole feeding on gas , will the observer ever see the blackhole grow in size expanding its event horizon ?

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marked as duplicate by Rob Jeffries, John Rennie black-holes May 4 '17 at 10:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.