Classroom Aid - Newtonian Cosmology

[Krisoler]

It is just what I was looking for, a magnificent and clear explanation of Friedmann's equations, however it seems to me that Friedmann never explained where space arises from, even when you say that although the acceleration is always negative, an expanding universe can occur, thanks to the initial conditions of the big bang, but it does not say from where the space arises. It seems to me that phenomena are mixed, the negative acceleration of the gravitational attraction is not the same as the deceleration in the creation of space.

[maestrosk]

"The only force at work here is gravity"... I bet you (a broad "you") will bitterly regret that statement one of those days.
And no I don't think it's just an EU thing. It's just not enough to say "gravity is everything"... it leads to dark matter theories.
They sound good when DeGrass Tyson or Morgan Freeman talks about them, but they're not good.

[sychrovsky]

Gravity the only tool in the tool box, Get up to speed and check electric universe