this post was submitted on 10 Apr 2024
253 points (91.2% liked)

Showerthoughts

30337 readers
822 users here now

A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The most popular seem to be lighthearted, clever little truths, hidden in daily life.

Here are some examples to inspire your own showerthoughts: 1

Rules

  1. All posts must be showerthoughts
  2. The entire showerthought must be in the title
  3. No politics
    • If your topic is in a grey area, please phrase it to emphasize the fascinating aspects, not the dramatic aspects. You can do this by avoiding overly politicized terms such as "capitalism" and "communism". If you must make comparisons, you can say something is different without saying something is better/worse.
    • A good place for politics is c/politicaldiscussion
    • If you feel strongly that you want politics back, please volunteer as a mod.
  4. Posts must be original/unique
  5. Adhere to Lemmy's Code of Conduct

If you made it this far, showerthoughts is accepting new mods. This community is generally tame so its not a lot of work, but having a few more mods would help reports get addressed a little sooner.

Whats it like to be a mod? Reports just show up as messages in your Lemmy inbox, and if a different mod has already addressed the report the message goes away and you never worry about it.

founded 2 years ago
MODERATORS
vatlark
forkball
Thekingoflorda
253
The reason why we never meet time travelers is because our civilization ends before the technology can come to fruition. (self.showerthoughts)
submitted 9 months ago by TheGiantKorean to c/showerthoughts
100 comments fedilink hide all child comments
 

Sort of similar to the Great Filter theory, but applied to time travel technology.

you are viewing a single comment's thread
view the rest of the comments
[–] Dasus -1 points 9 months ago (1 children)

Time travel within the same universe is not possible

Not exactly true. Technically, paradox free time travel would theoretically be possible.

As long as the time travel follows the Novikov self-consistency principle, there's no need for parallel universes.

Essentially the type of time travel employed in Harry Potter and the Prisoner of Azkaban. So you wouldn't be able to change anything, even if you did do things — as if you did something, it had always already been done previously (before you travelled back).

[–] 3volver 0 points 9 months ago (1 children)

It is true, don't waste my time.

[–] Dasus 1 points 9 months ago (1 children)

"it's a fun fiction which is always contradictory in some way" <-- that is not true.

General relativity allows for closed time-like curves and the existence of those means time travel isn't necessarily impossible, and if that is the case, it has to abide by the Novikov self-consistency principle.

Willfull ignorance wastes only your own time.

[–] 3volver 0 points 9 months ago (1 children)

In that case time travel would be meaningless regardless, impossible to prove, and doesn't matter.

[–] Dasus 0 points 9 months ago

Dumbledore disagrees. The type of timetravel that happens in HP: Prisoner of Azkaban is self-consistent. Same as with Rick's timetravel in the snake episode of Rick & Morty (specifically excluding the snake time travel, which is an example of non-consistency, leading to endless paradoxes).

Now ofc having a timeturner and/or a timemachine would be the impossible part there, but again, CTC's are technically allowed by GR.