Seven billion light years away and with two million billion times the mass of our Sun, the cluster was nicknamed "El Gordo" - "the Fat One" in Spanish.
"By looking at and understanding the properties of ElGordo, we're able to understand the time evolution of the structure formation of the Universe, " Prof Hughes told BBC News.
Clusters like ElGordo release energetic particles that have an effect on the cosmic microwave background, the extremely faint glow left over from the Big Bang that permeates the Universe.
Anglesey Council's trading standards officers say the scam is being run by a company calling itself the ElGordo de la Primitiva Lottery in Madrid and has nothing to do with the real lottery in Spain - ElGordo.