Perhaps there is no expansion, at least not due to a big bang which never happened. About 20 years ago, Halton Arp and John Bahcall published a debate in The Redshift Controversy, presenting both sides of the argument.
The Redshift Controversy is about how our universe came around.
( z1 controversy :name ( z2 name :op "Redshift" :op "Controversy" ) :topic ( z3 thing :manner-of ( z4 come :ARG1 ( z5 universe :poss ( z6 we ) ) :direction ( z7 around ) ) ) )