Knowledge, the big bang, and more

[river]

Write4U said: ↑
It depends on the state of the object. If the object is in a stable compressed state, it's gravity goes inward toward the center of the source in the form of a spacetime warp. If the object is in a state of breaking apart (expansion), it's gravity goes outward from the center of he source in the form of gravity waves.

To the galaxy , it is not stable my post#16 . All galaxies have stars moving outward from the source .

Actually river is forever asking that question, as if it should mean something.
The simple fact of the matter is that gravitational waves are analogous to throwing a stone into a still pond and watching the ripples propagate, then imagine that in 3 dimensions. They are simply ripples in spacetime.

One directional wave . Outward from the source . There is no inward ripple , in spacetime .