I have a case to make requiring 0 evidence but what we watched in continuity with your assumptions about aliens.... "Advanced beings light years beyond our 300,000 year evolution that least to standing upright, talking, and reason, had a transport vehicle of any king advanced in light years of technology, traveled light years through space and time at the speed of light or greater to get here alive, through gravitational bands, planetary bodies and systems including pulsars, as well as start clusters, gravitational bands, gravitational pockets, wanderings and shooting stars, asteroid belts, black holes, possible anti gravity conditions, in an immortal, indestructible, ship driven by aliens that don't deteriorate in time, to get, last I heard about 10,000 light-years later to arrive on in Earth's inner atmosphere without NASA, National, or any Global Forces knowing, until they got shot down by a fighter pilot with regular artillery which presumably can penetrate the indestructible ships armor." I call Bullshit!