4 ms·

Here's a good explanation of why FTL causes causality issues. http://www.physicsmatt.com/blog/2016/8/25/why-ftl-implies-time-travel http://www.physicsmatt.com/

Here's a good explanation of why FTL causes causality issues. http://www.physicsmatt.com/blog/2016/8/25/why-ftl-implies-time-travel http://www.physicsmatt.com/blog/2016/8/25/why-ftl-implies-ti... The sonar example works only if everything is traveling in roughly the same frame of reference. You're not accounting for relativity and its effects on space and time in your analogy.

circlefavshape 5y ago
I still don't get it. That analogy assumes that light is the only way causality information can be transferred - i.e. if I see the phone call being placed before its sent then it seems like causality is violated. But it I look at what's happening via the FTL phone then I can see that it's not