@FBM,
FBM wrote: It doesn't and nobody claims that it does. The theory says it happened 13.7 billion years ago.
The theory doesn't claim exactly that. One of its claims are: traces of the Big Bang can still be observed on the radio telescope and in few decades they will become under the radar (would not be able to be detected any more). So the theory claims that the events that are observed along the 'edges' of the visible Universe are Big Bang in action and 'in real time' - what has arrived here 13.7 Bya later. The first question is: how much time has the Big Bang needed to 'expand' from zero-D space into a Universe with a radius of 13.7 billion light years? Time Zero does not exist in the physical world. If the Big Bang is expanding at the speed of light in vacuum it will need 13.7 billion years to 'reach' the present day observable 'edges' and another 13.7 Bya for the light of the observation to come back. If the Big Bang has expanded in zero time, how much is the rate of expansion 'to make' a Universe with a radius of 13.7 billion light years? There must be something totally wrong with all that cosmological model ... and theory.
O.K. let's accept that the Big Bang has expanded at a speed of 13.7 Bya/Zero-t (and is accelerating - whatever all that might mean). What is observed on the radio telescope along 'the edges' of the Universe at present is what has been there 13.7 Bya, right, and has arrived here 13.7 Bya later, and we can observe that past at present, because for the observations we will need to wait for the light to travel from there to here and to pass that distance of 13.7 billion light years (if the distance is that).
IMV this scenario for the 'creation' of the visible Universe might be rather spectacular, but is highly improbable.
FBM wrote:The BB has no power to do anything.
... Except for the energy, which obviously has been enough to create the Mass & the Energy of the present day Universe.
FBM wrote:It's over. Done. In the past.
With all that distances and ages nobody can be sure what is in the past and what is in the present, what is game over and what is online.
FBM wrote: You're speaking of it as if it were a proposed diety in competition with yours.
You may be kidding, but 'the theory' of the BB is not too far away from the theory of God. God is
omnipresent, and so is the Big Bang (it can operate everywhere throughout the physical & metaphysical world); God is
omnipotent and so is the BB (it can create anything in contradiction to any law - not only of physics and math logic); God is
omniscient - and so is the Science, which is trustee-in-chief of the Big Bang ... and its most zealous apologetics ... as is the Church in relation to God. WFM
FBM wrote: Why? Because you demand it?
No, it has nothing to do with me and any demands. You simply cannot built a skyscraper on quicksand ... unless you demonstrate that it is possible.
FBM wrote: Do you demand the same exactitude for claims about your invisible sky-king?
The unconditional assumption that God exists
a priori is not too far away from the assumptions that an explosion can create 3D space out of zero-D space by expanding into the 11-D hyperspace at the minimal speed of 13.7 Bya/zero-t ... and accelerate 13.7 Bya ever after.
FBM wrote: Show me observable phenomena and necessary inference that contradict it, then.
First of all you don't know what you are observing at all (whether it is expansion of space or shrinking of the particles with the time, for example), and second you have no guarantee that you are not observing things with huge gaps of missing information of any kind, and third you don't know where these gaps of missing information are, and how far they may spread.
FBM wrote: That said, scientific theories are openly tentative and open to revision.
I don't see any mindset among the BB apologetics to revise anything, but after you are saying it.