If they exist it’s a load of very minor differences. Like a single piece of grass not growing in the same place, or some molecule being in a slightly different place than it was in our universe.

My thought being that most of them relative to us have variants so minor we wouldn’t even notice if we’d see it. Like sure, horrors beyond our comprehension, but then there’s just as many where the differences are so minor if we could got to a parallel universe we’re likely to not even notice.

Most of the theories would suggest basically an infinite number of parallel realities/universes. Such that it is incomprehensible and not worth thinking about IMO. What does it matter which of these universes you are in?

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I like the idea that gravity might be affected by the interactions between universes. That got me thinking that the existence of multiple interacting dimensions might provide a workaround for a real life warp engine to warp space/time with much, much less energy than current models suggest.

Its a science fiction trope. It has no physics to back it up. There is an idea of a "Multiverse" based on weird version of Braine theory. But in each of those the laws of physics are so wildly different to our every day that they have no space or time or so on. It has no meaning for us, and I am suspicious this theory has no actual science to support it.

The way I see the parallel universe idea is that there’s ultimately a single universe but an infinite number of different ways to perceive that same universe. The traditional idea of every moment splitting based on every possibility (as is determined after the event has occurred) to be seems absurd and a fantasy of science fiction

There's one where the USA uses the metric system, and consequently there's world peace.

There's another one where I put on sneakers this morning instead of work boots, and now I have a few missing toes in that universe.

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There are two scientific theory that get cited when "almost the same Earth" comes up.

1. Is the multiworld hypothesis where every quantum event splits into two different worlds so you have alternative realities where everything that could happen has happened.

2. The other is that in an infinite Universe there is enough variety for almost the exact Earth to have evolved the exact same except for some tiny variation. Every possible variation exists somewhere out in infinity.

Not quite what some mean by parallel Universes.

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Completely agree, I've actually gotten into arguments with people who legitimately believe that parallel universes are real and supported by scientific evidence, and then they cite a bunch of theoretical articles that are only supported by more theories.

There's an entire pseudoscience subculture built around theories like parallel worlds, time travel, higher dimensions, simulation theory, etc. Literally just things that science fiction writers made up from their imaginations but because of decades of pointless theoretical "research" and theories built upon more theories people are now convinced they are real.

The best way to advanced human knowledge and understanding of the universe is to observe and study the universe, pulling a fantastical theory out of nowhere and then spending decades trying to prove its existence is backwards and futile.