A priori arguments suggest that something existed before anything came into being, and as the “steady state” concept was disproved meaning the universe was not eternal the only remedy for something rather than nothing was a creator.
Whilst I doubt that this science programme from the BBC with Professor Al-Khalili will satisfy any young earth creationist it does try to answer that question with science. Hope to get round to watching soon – enjoy! (Reposted videos from here).
Part One – Something
Part Two – Nothing