Mr. Knoch in a recent UNSEARCHABLE RICHES refers to Job , from the Concordant Bible,  in his explanation as to how the earth was formed, where we read “God..is hanging the earth on nothingness”..I prefer this rendering, but it’s too long for the title.
He goes on to say, that this explanation needs no further clarifying. indeed, he believes that any cosmological theory , couldn’t improve on this statement in Job.
He says, “It is the only cosmology which seems to harmonize with the celestial destiny set before us” .
He describes the heavens as all that consists of  the Universe less earth.
That’s a lot of territory that we believers will roam around in.
I think it’s reasonable to say that the heavens and the celestials are one and the same.
Mr. Knoch continues his discourse by making it plain that our bodies will be changed to conform to that of the Christ. In this form, we’ve read where He could appear anywhere quickly and disappear as easily, and His ascent was effortless and speedy, even though He could still enjoy many of the sentient things humans presently enjoy.
Only then, when the transformation takes place, will the ecclesia be able to live anywhere among the celestials, amid other occupants in planets, whose environs is deadly  unsuited to humans.
 Paul said that the change to select humans will be instantaneous from mortal to immortal..that says it all..paulnbob