We have gone to our moon a three day trip with our current technology covering 450000 miles. For aliens to travel from the closest habitable star it would take at the least 14 lightyears which is 14x((((186000x60)x60))x24)))x365))))miles away. Voyager 1 which left Earth in 1977 has yet to travel a single lightyear. There are no aliens here. Get over it.
Not a problem if time, space, and distance is adjustable from portal jump points. Jump in a portal and pop out in another in just minutes. Wormholes are real.
You are assuming that the tech we use now is the only means of travel the stars - I refer you to “James Clerk Maxwell: The man who changed everything”
Four of his 200 field equations were transformed into vector equations by a self taught man named Oliver Heaviside who lived in his mom’s basement.
Those 4 gave us everything we know about the electromagnetic spectrum, and without which, neither Tesla nor Einstein would have been more than obscure family names.
Maxwell postulated instantaneous travel from anyone point to any other point in the Universe as well as free energy (what Tesla was attempting), and more. No one publicly has looked at his original (now rare) work since.
So do not be so certain about what human science knows - chances are that most of what we know is wrong, and the little we do know is distorted.
The August 1863 edition of Scientific American included a discussion of whether or not the Sun was a lump of burning coal, in which case it’s age would not exceed 5,000 years. They had no knowledge then of the nuclear strong force, so the Sun being made of coal was one of the best explanations they had at the time. Today, our knowledge of Physics is certainly greater, but no less incomplete than it was then.
Bingo
I did the math and Voyager 1 currently is 14.163 billion miles from earth. The time light would travel that distance is about 21.1 hours. Not even a single 24h light day yet.
This is worth a listen—some interesting concepts you may not have considered:
https://psychedelicsalon.com/podcast-261-the-definitive-ufo-tape/
Even if you disagree with most of what Terence McKenna says, you will still learn some now stuff.
The guy was off the charts brilliant.