most planets out there would compare to our like comparing a marble (which would be earth) to the size of the earth! as in, earth so freakin small its silly, and if u think theres billions of stars and planets in a galaxy, and then theres billions of galaxies then you would be pretty thick to think that were the onlyplanet that holds life lol its just impossible. and as for it being a helicopter, for the light to be that bright it must be seriosuly close, and there was no wind so we would deffo of heard it!