It has always been obvious to me that time travel to the past is and will always be impossible. If it were ever possible, even 10,000 years in the future, we would be flooded with tourists from the future, because there would be no way to infinitely keep such technology from being misused.
But who says it hasn’t been? One of the things I enjoy in the world is “parallel thinking” when 2 people who have no contact with each other have basically the same idea at the same time. Just one silly example is that Steely Dan was negotiating their new record contract to be a band in name only (no touring, no real set membership, just the 2 head guys bringing people into the studio) in New York at almost the exact time Alan Parsons was shopping a studio only “band” around the record labels in London.
I find these parallel things interesting because there’s no good explanation. So one possible, no worse than all the others, explanation is time travel. Maybe Steely Dan didn’t do that, but Alan did, and then some time traveler knowing what happened to Steely Dan in their 2nd contract and how Alan Parsons Project worked, went back in time and met up with Donald Fagen in a bar and said “you know what would be cool...” And now we have Aja one of the greatest albums ever.
You also have to account for motion of the earth and the sun. Let’s say you go back in time, say 100 years,....maybe it could be done ...but then when you get there...you’ll be at least a partial light year away with no way to get to Earth of the past. You’d have to travel in a spaceship to get there and you’d have to find it as there is no assurance that when you went back 100 years, that you would be in the same place that you were when you left 2025 so that you could track it to the place it was in 1925. No way to know if the time jump won’t spatially leave you 100 years past but in a distant galaxy and no way to go home!
Michael Masters (and some others) claim that many UFOs are in fact travelers from the future.
https://www.amazon.com/Extratempestrial-Model-Dr-Michael-Masters/dp/1733634045
There are a whole lot of UFOs—almost a traffic jam.
If you want to go even deeper into that rabbit hole—meet Dan Burisch:
https://www.youtube.com/watch?v=1SIkhgxfn-c