I heard some scientists say special relativity may not be relative to your frame of reference, but rather possibly distant galaxies or great sources of gravity? I heard they sent a jet around the world with an atomic clock, and also decaying sub atomic particles down a tube, to test special relativity. Have they done any tests to see if it's really related to one's frame of reference, like the Twin Paradox tells us? Or could time/space rather be relative to distant galaxies or large sources of gravity? Is anyone familar with this?