What happened was their aircraft was struck by lightning and they lost control, now they control these aircrafts through their thoughts, that is how they are able to travel through the universe at an amazing distance. They were ofc interrogated by some generals, kept for a few weeks, learned English, their iq is immeasurable by our standards, if we were to try to calculate it, it would be somewhere around 1500 iq, but yeah after a few eeks of interrogating the being left and they let the generals keep the craft, they reverse engineered it and out came the technology you see today.