Imperial_Samurai> What do you mean by accurate or certain? Do you mean, how certain are we of quantum-stuff? Lasers, electron-microscopes, MRI-images from hospital-scanners, di-odes and transistors work through quantum-principles. So I’d say we are certain of quantum-principles.
See, the thing about Big Bang deals with an as of yet unsolved mystery of science: How does gravity work on the smallest scales in the Universe (such as, inside a black hole or… at the be-ginning of the Universe).
We see the Universe expand (as it should, according to Einstein, whose equations predicted this, before it was known), so if we “rewind” the Universe like a movie, everything must at one point have been together. If we also rewind physics, so to speak, everything fits with observa-tions and collected data (such as the cosmic Microwave background – a sort of echo from the Big Bang)… up until a tiny fraction of a fraction of a millisecond after Big Bang. We can’t go beyond that time back to time 00:00, because we still don’t understand every aspect of gravity.
We need quantum gravity, to understand gravity at the quantum-scale like we’ve done with electromagnetism and the weak and strong nuclear-forces (Which in turn gave us the possibil-ity to manipulate these forces).
So I (and I AM a scientist, a high-energy physicist) would say we’re 99,99999 certain of the Big Bang (the remaining 0,000000001 percent is not as much due to not thinking the Big Bang happened, but because quantum gravity may make a twist on the actual event from the time 00:00, to that tiny split-second after).
Clickclick> Ah, but there is lightyears between believing some ONE created, and that quan-tum-physics created.
To understand how something can emerges from NOTHING 1+(-1)=0. So something and an equal amount of it’s opposite amounts to NOTHING.
Now – that is possible in quantum mechanics. A photon can create an electron and a positron.
So, from nothing you can get matter and an equal amount of anti-matter. You may even break the laws of conservation of energy, as long as you do it over a short period of time (Heisen-bergs Uncertainty Principles).
Voila – The Universe.