Ok here is my proof if u wish to embrace it. First the probability of them being space travelers is precisly nill, the implications of light speed and above are too great even for highly advanced inteligence. Second and more important is the FACT that many of our ancient cultures document accounts of "the sons of god" comming down and mating with our women creating a hybrid race of giants and/or highly intelligent and powerful beings. The Sumarians called them Annunoki* the Greeks beings like Hercules. The list goes on and on. Reserch for yourself. Third the Biblical account of this the pourpose for the interbreeding was for the fallen angels/Lucifer to taint the human bloodline basicly it was an evil and decietful plan. Now to the alien/ufo phenominon of today. Theese beings have lied to us about thier agenda from the beginning this suggests they have somthing to hide[ thier true identity] also they seem to have abillities that are more andicitive to interdemntional beings such as apearring and disopearing in a flash, possesion of the human body, and so on.  To further support this theory they seem to be cunducting genetic experiments [ tainting of the bloodline]. I cant post the emence amount of evidence to support this I suggest you reserch for yourself. The evidence is overwhelming and speaks for itself

Ok this principal of moving space around an object is definatly the answer to the cosmic speed limit because space itself is not bound by it. As far as removing the mass of an object you would first have to eliminate the Higgs Field or at least the effect it has on the particles of said object, then you would have to devise a way to keep the particles in tact or manifest in some way. Being we are moving space not the object removing its mass wouldt be nessasary.