Simplifying, this is my first post of this anywhere, so bear with me.

The Big Bang created space. A lot of those forces are still present, particularly in stars. Stars create space, and as more form, space is created faster. This space is being created between galaxies, and this is where missing gravity is going - We're falling through fresh space, removing potential energy, and sustaining our orbit.

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Moderator Note

This is insufficient for a science discussion. You need a model and/or evidence to support your claims. Not just this hand-wave.

 

47 minutes ago, CrowDiehard said:

Stars create space,

In the current cosmological model, stars do not create space. It's vacuum energy that does this job.

Stars accrete from clouds of previously existing matter.

1 hour ago, CrowDiehard said:

this is where missing gravity is going

We're missing some gravity?

11 hours ago, Phi for All said:

We're missing some gravity?

Maybe we should check between the sofa cushions.

28 minutes ago, Janus said:

Maybe we should check between the sofa cushions.

THAT explains the extra sag in them lately!