>>12412941As with newton's laws, they are true within certain bounds.
The Theory of General Relativity is as well established as any other offical theory, meaning there is no evidence that contradicts its. Dark energy is actually captured in the theory as the cosmologic constant (Einstein's biggest blunder)
There are theories that are incompatible with it, like quantum mechanics, which implies the theories may potentially need extending.
The biggest indicator of our cosmological models being incorrect is the rotation of galaxies not working correct... So with no better equations for galaxies (like a fifth unmeasurable force at large distances) dark matter was invented
In the same way Einstein extended Newtons theory of gravity and motion, Einstiens theory will be superseded.
Newtons equation are first order approximations of Einstein's equations
Personally i wouldnt say Newtons theories are not classes as falsified, just improved apon
Spacetime is unavoidable, that are interwoven, hence 'the fabric of spacetime'
You navigate in 4d everyday, you will plan toeet someone at a time and a place, thats just a 4d co-ordinate in physics
