ok Milkyway is not a modren term, it is a Greco-Roman term to denote the Path of pagan gods when they ascended to the sky. Nova is a relatively newer term and therefore research is required, but Andromeda is Classic Greek term and there has to be some Arabic or Persian translation for it. Urdu being mix of both so it is plausible that there is a word. Blackhole, Worm Hole, Anti Matter, Event Horizon are quiet modren theories and therefore not discussed by Arab or Persian Scientists therefore we might not have any words for them.By the way such a serious topic was discussed in such a casual way on this Forum, for a moment I thought I was on the set of AFTAB IQBAL's KHABARNAK.....very SHARAAMNAAK Behaviour.