And by aliens I mean, outer space creatures and UFO. For whatever reason all UFO sighting footage looks either fake or like recorded with a Casio keyboard. And I find hard to believe we don’t have any decent footage of them with all the surveillance and technology we have now.
Edit: 🍿
The Alcubierre drive is theoretically possible, but requires negative mass to function.
The bigger problem is that these super fast aliens wouldn’t know where to look. We’ve only been weakly broadcasting our location for around 150 years. Less than 2% of the milky way have had the opportunity to see us.
Now, if we were seeded by aliens then that would be different.
When I consider the inverse square law, I think that after a little while any one of our broadcasts may not even be distinguishable from background radiation…