Theoretical upper limit for existing black holes: ridiculously stupidly big
from Luke McKinney at the Daily Galaxy:
Scientists have determined the mass of the largest things that could possibly exist in our universe. New results have placed an upper limit on the current size of black holes – and at fifty billion suns it’s pretty damn big. That’s a hundred thousand tredagrams, and you’ll never get the chance to use that word in relation to anything else.
Read more here: 50 Billion Suns -The Biggest Black Hole in the Universe