What is the evidence for the big bang.

[Marley23]

@Jon55

Would you prefer me to post my arguments on that page?

You may as well post in your own thread - I was just pointing out that a lot of this was already discussed just a few days ago.

@Marley23

We can see from Dopper shifts that some galaxies are moving away from us, and we can see that galaxies that are farther away are moving away faster. […] the first piece of support for that theory is the cosmic microwave background. The Doppler shifting of light is also a significant piece of evidence.

@Meatros

Erm, no, not according to my understanding. Cosmic inflation (aka big bang) was determined by empirical measurement, via red shifting among other things.

@MEBuckner

It is an observed fact–not a postulate or a hypothesis or an article of faith or anything like that–that when we measure the distance to far-away galaxies, and then look at the light they emit, we see that they have a red shift proportional to their distance. We know from experiments on Earth (and basic physics) that a red shift can be caused by something receding from the observer.

That is the evidence, to start with. Later on, they detected radio waves from space–in all directions, any direction you look–called the cosmic background radiation–which was predicted to exist, before anyone actually detected it. It’s considered a very good sign for a hypothesis if it predicts that evidence will be found, and then that evidence is, in fact, found.