Several Qs here really, about scientific theories. Lets take the example of String Theory in physics for instance. Its just a theory, yet it seems to be accepted as more or less correct these days.
Can anyone just publish a theory of this kind that they have? Do you have to have special qualifications or status to do it. And what makes it accepted by everyone else rather than simply ignored? (I guess being able to prove the theory works in the real world makes it good, but String theory must be one of the hardest things to actually prove surely?). So maybe the fact that it just 'sounds/feels right' gets peoples attention initially, though that in itself is not enough to be accepted until some sort of proof appears?
How would you get something like this published -send it to a science magazine or a Scientific body of some sort?
And why would someone do it? Yes I can see the 'glory' angle -your name goes down in history forever more as the 'discoverer' of this then-new concept, and you have the satisfaction of knowing you contributed to the advancement of science. But is there any financial gain to be had? After all a theory alone -even if correct- cannot be patented to get royalties like an invention can.
Im answering my own Qs here to some extent but please fill in the gaps with your answers too.

