Let me say at the outset that there are no UFO’s, and interstellar visitors cannot exist. The distances are too great, and even if such travel were possible, there would be no reason to visit here. At the outset of such a journey, no intelligent life would have existed here, and so there would be no reason for this destination.
I do suspect that intelligent life abounds in the galaxy and universe. But it’s a frustration, as I will never know for sure, as there will be no “Contact.”
I am curious about ‘seeding’ – the idea that life on one planet can seed life on another. So a scientist finding a rock in Antarctica showing evidence of microscopic life on Mars is intriguing, to say the least. But there is not enough evidence to test the hypothesis at this time, so it is idle speculation for sci-fi buffs. And fun.
All that said, there is an “Area 51” in Nevada, and top secret programs were run from there. They did reverse engineering of foreign technology (other countries – not planets), and developed high-speed aircraft that looked like flying saucers at certain angles. They had tunnels through which they transported rockets. Aircraft crashed, and civilians coming upon the crashed aircraft had to be bought off to keep them quiet. The U.S. government never officially acknowledged the existence of the facility, and its airspace was off-limits, all the way to outer space.
We know this now because parts of what went on there have been declassified and some of the men who participated are now allowed to talk. And they have.
Piece of Mindful 