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Questions tagged [paradox]

For questions in which an event, object, or idea contradicts itself, defying logic.

26
votes
22answers
8k views

A solution for the time-travel paradox - What could go wrong?

Time travel has been invented and it goes like this. You travel backwards in time at the same speed you normally travel forward. Everything is identical - you do all the actions the same but in ...
3
votes
2answers
251 views

How exactly would this chronology protection for my FTL drive look like?

The problem with FTL is that, due to the tachyonic antitelephone, it allows causality violation: I send you a superluminal message (you are moving away from me at relativistic speed), you reply with a ...
1
vote
3answers
476 views

What if we discovered a real paradox? [closed]

On an elementary school in the US, there was a teacher who used to give the pupils math exercises he invented himself. One day, they calculated the cathetus of a right triangle and magically, they got ...
19
votes
8answers
3k views

How do you prevent causal loops from happening with the Novikov self-consistency principle?

The Novikov self-consistency principle states that all changes that occur due to time travel into the past were always part of history, and so the course of events is not changed. While this is useful ...
20
votes
17answers
8k views

Avoiding preventing your own birth in a time travel paradox?

Assume a world with no multiverse theory, just a single unbroken timeline. If you were to go back in time to the town your parents lived in on day of your conception, the air displacement due to your ...
0
votes
1answer
134 views

Making an internally consistent, logical set of rules for time travel (based off of this video)

https://youtube.com/watch?v=XayNKY944lY Something similar to this. Okay, so the basic plot structure I want is that there are two parallel timelines, both of them potential futures for our world. ...
140
votes
39answers
45k views

If time travel is possible in the future, no matter how distant, why haven't they come back to tell us?

In a world where time travel is possible, but has not been invented yet, would travelers from the future come back to prove it exists? Surely, they would bring that technology back in time to let the ...
2
votes
4answers
443 views

Is moving faster than light speed a paradox? [closed]

Let's assume that somehow humanity invented a teleporting machine that could momentarily transport a person over very large distances (up to several light years). As we know, the speed of light is ...
8
votes
14answers
3k views

What would two people reading each other's mind think? [closed]

Imagine that two people who have the ability to read anyone's mind confront each other. Each one of them knows that the other is able to read minds and so they try to read each other's mind. Let's ...
5
votes
8answers
2k views

Is the scientific method viable in a world with a god that can and does bend reality by will?

Consider our world at 18-19 centuries. Our civilization knows how to print books, build steam machines, we have made first experiments on electricity. And one day the Mad God Sheogorath is emerged. He ...