How do you even know they can't just bend space or some other sci fi shit? Maybe they are not that far away from Earth as we think. There are ancient drawings depicting ufos in caves btw.
I read a book called A Wrinkle in Time and there are three women named Misses Whatsit, Misses Who, and Misses Which, who use a tesseract to get across long distances in space, and they say that it's like an ant traversing a string held up by two human hands, and instead of traversing the whole string, the humand hands get closer to each other so the distance the ant needs to travel is way less,
https://www.thewrap.com/wrinkle-time-tesseract-sound-familiar/
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In the novel,
Mrs. Whatsit explains that if we understand space to be three-dimensional, and time represents a fourth dimension, then the tesseract is a fifth-dimensional bridge between two points in time and space. She uses the image of an ant walking on a flat string. The ant can get from one end of the string to the other by walking its length — but if you fold the string and bring the ends together, the ant can reach the end much more quickly and easily.
A tesseract is the literal “wrinkle in time” from the title, which is also a wrinkle in space. While “A Wrinkle in Time” keeps its tessering fairly simple, the idea is that you use your mind to fold the fabric of space together to bridge two faraway points. In other words, tessering creates a so-called Einstein-Rosen Bridge, also known
as a “wormhole,” a concept predicted by Albert Einstein as part of his theory of general relativity.
The word “tesseract” refers to something else in other circumstances. It specifically describes a shape: a visual representation of a cube existing in the three spacial dimensions and the fourth dimension of time. It’s weird to describe, but
a tesseract sort of looks like a cube within a cube, made up of many cubes.
Probably the most likely place people have recently heard the term “tesseract” is from the Marvel Cinematic Universe. In those films, a blue cube that first popped up in “Captain America: The First Avenger,” later revealed to be an infinity stone, is called a tesseract. It was first used to power the super-strong weapons of the Nazi group HYDRA. And later, the tesseract was used by bad guy Loki in “The Avengers” to open — wait for it — a wormhole that let an army of aliens through to attack New York."
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