It's true that we don't have direct measurements of cosmological redshift.
But there's lots of things we don't have direct measurements of but which we're still very certain about.
We DO have indirect measurements, and we have considerable confidence in our inferences. That's not proof, but then, very little in science ever actually is.
Look at the image
http://www.puicet.com/wp-content/uploads/2011/06/scientific_method_2.gif
As you very fast can conclude; the BigBang theory is not a theory it is only a thesis, - only speculation. It is first SCIENCE when it has pass the scientific method.
It is called a theory and that alone is unrestrained dishonesty.
The fact is that if GR is correct,
But this doesn’t mean the range of GR or even the already known part of SR is fully understood. GR is a theory beyond imagination and beyond direct observation. WHAT is for example the curvature of space really?
Try to IMAGING it and tell me about the inner images you saw. - You cannot, because you (and no one else) can even not fully imaging what this theory is really about.
then cosmological redshift MUST happen.
Explain why you think so, - which process ? - how does a photon interact with space ? - how does space “expansion” interact with a photon? - I believe you have several missing evidence “links” here ?
Again which inner images do you see?
Which evidence do you see ?
If you cannot explain what you just wrote to you grandmother, because you have not understood it, - and if nobody else can nobody have understood what you just wrote – how can say such is a CERTAIN TRUTH?
Furthermore Einstein calculations (not GR) did show that either the Universe would either expand or it would contract.
These calculation we here talk about is in its cow logic essence only that because the universe is a field of gravity either it should be in a process of collapsing, - if not then it should expand (due to a “unknown opposite force”).
To “solve” the problem Einstein invented the cosmologies constant.
There was NO prediction that the Universe
should expand.
I don’t understand how you can claim there was such prediction in his theory. ?
There is no ambiguity here: it's an unavoidable consequence of the theory. Now, it is possible that GR is wrong. But first, we have no evidence that it is wrong.
Much have a deeper "level" of understanding, - for example a magnetic field, - WHAT is a such. - We can bal bla bla abuot empty words and expression but we cannot tell grandmother about the inner images we get when really trying understanding its nature.
GR is the exact same principle - so even though GR is correct, we have maybe only really understood 10% of what this theory really is about.
Finally I do of course not agree that GR have predicted the expanding universe, and that the evidence should be cosmological redshift, - this is what just wrote right ?
If this was true he should also answer where the dark energy comes from, when it will end, and why it seems to accelerate, - right ?
You cannot predict that tomorrow will be born a 17% cow , - can you ? - Hence also not a ""17% expanding Universe"", can you. - Where is the full story then ?
And second, and even more importantly, we have considerable evidence that it's very accurate, which means even if it is wrong, it's unlikely to be wrong in ways which eliminate cosmological redshift. Just like Newtonian mechanics is wrong, but you'll get very close to the right answer much of the time you use it.
I didn’t got the point
Bjarne
1.Is it possible that redshift from stars reaching us is caused due to gravity difference?
Ziggurat
No. The answer to #3 is quite definitely NO, not yes. Whether or not any mechanism exists for gravity to "go mad", we don't know of any.
I don’t understand how you can claim so, extreme speed do cause extreme gravity.
Kinetic Energy is conserved as M, - and amount of M is responsible for “g” - this is simple and common knowledge.
We are talking about extreme speed.
And this is what we certainly must expect in a BigChrunch
Bjarne
2. Could gravity have been extreme much stronger billion of years ago?
3. Do we know any method whereby gravity possible could go mad?
Ziggurat
Furthermore, your question #1 can only be "yes" if your #2 is also yes. That might be possible, but 1) I'm not sure why you find the laws of physics varying with place/time to be better than current cosmology and 2) if we allow for that, well, we basically have to give up on making any sort of prediction about what's happening elsewhere.
It is all right to have some kind of hypothetical framework, but then it must also all the time be remembered to test; - is the framework really true.
Unfortunately a speculative framework too often becomes a theory (without objective reason, except that a lot of people believe in it) and then (almost) certain science, and then religion and then suddenly the concrete is too hard to change anything, instead is fanatic religion makes the rules, what is true or not.
We MUST
always be ready to give up a thesis, - but you just revealed that we
need “something” (doesn’t matter how thin the ice is).
The existing thesis is and has never been anything else as speculation – don’t be brainwashed naive to believe something different. Be prepared it can fall every day.
Argument from incredulity will get you nowhere here.
I know how much fanaticism am up against.
But don’t worry maybe tomorrow maybe after 1 million year the old speculation will fall.
Based on a pure GR framework, (which mean gravity difference from time to time is the cause of redshift) it is possible to predict several phenomena we shall see in the Universe.
For example the way we believe how the process of starts and galaxy formation took place long ago, is wrong, and how the right understanding is.
We already know that something is wrong to BB - here is for example a list problems top 30 list
http://metaresearch.org/cosmology/BB-top-30.asp
Add to that a lot more for example dark flow, a dark hole 1 billion LY across and a lot more.
As you saw in the film link form yesterday, the speculation will fall because of its own weight of assumption.
Skepticism is growing, and that will continue.