C C Wrote:EXCERPT: If time travel is possible, why haven’t we been visited by tourists from the future?
Who says we haven't? Assuming UFOs are something real, then perhaps they aren't space-aliens at all, but rather time-travelers.
The widespread reports of humanoid aliens suggests that if the reports are accurate, then the mystery beings have some evolutionary relationship with us. Bipedal chordates with eyes, noses and mouths in the familiar positions. Hands with fingers. (Real space aliens will more likely be... alien, both in anatomy and biochemistry.)
Quote:One possibility is that time travelers keep a low profile in order to avoid changing the past. But if they can’t change history, why would they even want to come here? Well, maybe they’re stealing our stuff.
It’s an idea Wesley Chu explores in his new novel "Time Salvager"—currently being adapted into a film by Michael Bay—about time travelers who visit the scenes of famous disasters and salvage materials that are destined to be destroyed anyway.
That plot has already been done, by John Varley in his truly excellent early 1980's novel 'Millennium'. It was made into a movie starring Kris Kristofferson, but the movie wasn't nearly as good as the book.
That one imagines a human civilization 1,000 years from now, living on a ruined earth with pollution and runaway diseases so rampant that human beings never live much past 30. They live fairly normally till they are about 20, then their bodies start to rot with cancers and infections. By the time they are 30, they are little more than heads tethered to life support machines as one organ after another has to be replaced.
Human reproduction in their time has almost hit zero and they realize that the human race is doomed. So they decide to create a human colony in their own far distant future, several million years away, after the earth has had time to regenerate itself. But they can't colonize it themselves, since their genomes already contain too many debilitating viruses.
So they need pristine breeding stock for the colony. And it has to come from before all the future diseases ruined the human species. The one thing they have going for them is time travel, but they can't make any changes in the past for fear of creating time paradoxes.
So what they do is target passenger aircraft that are doomed to crash with no survivors, open time portals into the planes and take off all the passengers, replacing them with corpses. (In one case there's a little girl who is the sole survivor of a crash who talks hysterically about the strangers coming out of a bright light and guiding everyone else into the light while telling her she has to stay, but everyone in our time dismisses her report as a NDE fantasy.)
Then a female time agent from the future, one of the book's protagonists, loses a future device in the present. It's found in the plane wreckage by a National Transportation Safety Board investigator, the novel's other protagonist. So the future time agent goes back to try to smooth over the paradox and retrieve the artifact originating a thousand years in the future. One of the things that makes the novel cool is that the agent, who has to visit our time repeatedly, and the investigator don't experience events in the same order. But they fall in love anyway.
There are some interesting touches, as she tries to conceal how ravaged her body already is by our standards (she's one of the healthiest specimens in the future) and her habit of chain-smoking absolutely noxious time-agent cigarettes, since our (relatively) pure air is poisonous to those who are adapted to breathing future pollution.
https://en.wikipedia.org/wiki/Millennium_(film)