Hello, new member here. I've been fascinated reading some of the threads and decided I had to register to ask a question that's always been a bit confusing to me. From what I've learned The Big Bang theory seems the most likely explanation of the start of the universe but there's one thing in particular I don't understand about it. Until after about a billionth of a second after the Big Bang when ElectroWeak symmetry breaking (the Higgs mechanism) occurred particles had no mass, yet the start of The Big Bang was supposed to be a singularity. Singularities are points of infinite density, how could it be a singularity if no particles had mass?