Within trillionths of a second after the Big Bang, they have reasoned, the primordial explosion - many billions of degrees hot - must have created a universe that contained equal quantities of matter and antimatter.
The creation of the universe is called the Big Bang. 
( z1 thing :name ( z2 name :op "Big" :op "Bang" ) :ARG2-of ( z3 call :ARG1 ( z4 create :ARG1 ( z5 universe ) ) ) )