Not sure what forum this question belongs in... so I'll post it here.
I understand the concept of gravity warping space but intuitively it's never sat well. But, hey, no one can be more a non-physicist as myself. So please permit me my ramblings so I can better understand where I must be wrong.
Here’s a thought experiment. Imagine a planet being instantly created in a universe with nothing else in it. Would it slowly lose mass though its gravitational field? Is mass preserved in a universe where there is an abundance of matter where gravitational energy is mutually exchanged?
Which leads to the bigger question… the discovery that the expansion of the universe is not slowing but accelerating has raised the question of some repulsive force in matter. But it occurred to yesterday whether this acceleration can be due to a radiational loss of mass in these galaxies as they fly further apart. Observationally how would one tell the difference? Empirically how would this be tested? That the orbits of stars on the outer bands of a galaxy might show signs of accelerating?
Thanks in advance for all your patience ;-)