right and space has always existed and just randomly an explosion happened(which isnt possible by the way) and formed 9 planets and a sun
1) We don't know whether or not space existed before the Horrendous Space Kablooie (Big Bang), but the general consensus is that time didn't exist before it.
2) No, "explosions" that are based on oxygen aren't possible in the vacuum of space, but your ignorance just made its grand appearance; the Big Bang began with all the matter in the universe concentrated on one point (a singularity), much like a black hole (it probably was a super-massive black hole, considering it had ALL THE MATTER IN THE UNIVERSE). From this, the universe was born when all of this matter was ejected (we don't know how, we're working on that) and the universe expanded rapidly (this is what was meant by "explosion", you space movie critic) as the matter condensed into what we see today.
3) The Big Bang model is based on the fact that everything is accelerating away from each other (Doppler shift), and therefore, away from a central point.