Recent content by Perduta

I think the replies were condescending, dismissive and confrontational as well as going off at a tangent from my original question which is WHAT physical entity are we to understand is "expanding" with respect to the way measure it. Secondly, the Equivalence principle clearly states that...

Well none of the geniuses here answered the simple Newtonian question in respect of the centre of gravity and the consequent accelleration we should see towards it... so what's the point in alluding to general relativity and more complex models. I thought we were discussing the balloon analogy...

Meh you're right, I can't be arsed with a forum full of know-it-alls. I was just asking a question.

Except that I give an explanation for what makes the balloon expand.

Meh - I read somewhere that the Hubble constant was decreasing. I.e in the future galaxies at a certain distance will be accelerating slower than the ones we can see currently at that same distance. OTOH if it is true that the universe is breeding more and more dark matter/energy to fill it's...

Correct. Every point in the universe sees everything else falling away from them just like we do. That is because the centre of gravity of the universe is unique to every observer. Observers at your point A will see point B falling towards your A'. Observers at B will see A falling towards B'...

No it is not impossible at all in fact it is nearly inevitable. It is quite simply the plain old concept of centre of gravity. To understand this, reflect first on how we would calculate the Earth's gravitational force at a point inside the Earth. The answer comes from Gauss' law. Then...

In fact the more I think about it the more sense this makes: The gravitational field is proportional to the volume integral of all the mass inside the enclosing surface focussed on it's center of gravity... which on the balloon is the entire universe centred on the opposite side of the balloon...

3 meters remain 3 meters and 3 billion light years remain 3 billion light years. They do not expand. Galaxies are just as "everyday" as anything else in the universe and I don't think anyone claims they are expanding. So the philosophical question remains: Exactly what is the thing that science...

Physically we observe an accelerated increase in distance between us and entities elsewhere in space. This has been experimentally determined as a function of the distance to said entities expressed in Hubble's law. Space, however is just a mental concept. Increase brings with it the concept...