The Big Bang and cosmology answer these questions, steady state theory falls short.
-The big bang is still just a theory while other theorys arise. In no means the big bang is the "truth". Science still wonder how the big bang did come to existence.
-The universe isnt steady thats is for sure, everything is changing all the time. The Universe is pure energy/electricity, what we see is just our perception of that energy, in the frequency zone of our own state of energy. Think about quantum physics, the more you see the more puzzled you are, particles come to exist and then vanishes again, thats energy changing its form in our zone of perception because of the influences of other energys, thats why accurate measurements cant be done in that field, only predictions.
-To me its much more acceptable explanation that everything has been and will be than that everything did came out from nothing (?) and will expand to infinity and to be frozen. That would mean that from somewhere beyond our universe there is energy input to our universe and in the end there is no more energy input ? If everything is energy we dont need extra input since energy dont wear off, it is just changing its form. (quantum physics).
Think about fractal theory, what happens in atoms are happening in cosmos too, just a larger scale. Start dividing one tell me when there is nothing left ?
Time to us is our perception of the ever changing universe of energy.
The ancient did knew these things, Shiva is the The Creator and Destructor at same time ~ energy/electricity changing its form. The ring surrounding Shiva reflects time ~ circle ~ infinity. The purest form that we know,
try squaring the circle, you cant as a consequence of the fact that pi (π) is a transcendental. The dance meaning movement~reforming.
For many reasons, but most important, because evidence leads us towards that conclusion. If matter had always existed, we would have suffered 'heat death' by now. Space is expanding, we can measure that. If time were infinite, as you have stated, space would be infinitely large, and the matter and energy contained within it infinitely, and equally distributed. But COBE showed us that there is asymmetry in the microwave background, not uniformity. Energy has not had time to radiate and become even. Matter is not equally distributed, because it has not had time to become so. The Universe is not infinitely large, because it has not had time to become so.
-Matter = Energy. Its just a really tiny glance of ever changing energy that we are witnessing.
We can measure the age of stars, and can tell 1st generation from 2nd generation stars. If the Universe were infinitely old, there would be no 1st generation stars, they'd have burned out long ago. Steady state Universe hypotheses require 'constant creation' Cris, maybe you aren't aware of that, but whichever you choose, you cannot escape that matter needs to be created as an input, either in one 'big bang' or continuously throughout the process.
-Can you prove where the matter~energy came from, the big bang, right ?
-So what is a big bang more than a theory, not stated as fact, because we dont understand it well enough yet or hardly any. So it is a battle between two
theory. And why is that energy are wearing out of our universe ?
-Everything is connected in universe, gravity theory, but if everything is energy the gravity should work in smaller scales too. ?. (quantum physics)
-My guess that what we call gravity is a side effect from energy storming in our cosmos
-In other hand I could be wrong, but waiting someone to prove it to me could be a long long wait