I i",y rctating binary ccvnc acd thr rio:.as arigir,al!y motivated by the chalnian "actioil a t a distailce." li,emaiklent evtints occuiring in quasars a i d lengt. of measuring ihe Rie~nann curvaably, the theory, withoui an arbitrary I galactic nuclei, has opened a new era lure tensor, an abstract mathematical parameter, made predictions of deparof general-relativity physics. In the object tha...