There is no question that we are a long way from mastering the physics of the universe. There is no question that there things that we can't yet imagine. And it seems entirely reasonable that there might be some way to bend space or in some way change the dynamics of travel.
That doesn't mean aliens!
There are at least one hundred billion stars in the Wilky Way. Its vastness is incomprehensible. Then try to imagine a block of space where the Wilky Way is one dot out of a million galaxies, keeping in mind that the distances between the galaxies are even greater than the width of the galaxies themselves. Then try to imagine that block of one million galaxies is just a single dot on an even greater block of possibly several million blocks, each with one million galaxies in them.
With that kind of vastness, it seems an almost certainty that there would be other intelligent life. But in order for that intelligent life to find us, they most certainly would have to have a much more advanced understanding of the physics of the universe, and it seems rather likely that, if they came here, it would either be in grandness beyond anything in earth's history, or they would be able to be completely undetected.
Flying around in little tic tac vehicles, at mach whatever, just doesn't fit the scenario, IMO.
Also, considering that everyone on the planet has a phone, and that the internet allows for immediate, global-wide communication to everyone else, if there were an actual sighting (at least in the last 10 years), that there would almost instantly be countless additional viewers. One grainy vid from a single camera, for a few fleeting seconds and then gone, is all we ever get. Again, doesn't fit the assumed incredibility of an actual situation.
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