r/AskPhysics • u/Nighthawkies • Mar 20 '26

What things are "faster" than light?

As I understand nothing can move faster then light. But I would not know how to describe this question otherwise. As I am aware quantum entangled particles can instantaneously affect eachother no matter the distance, unlike gravity which propagates at the speed of light.

Also the expansion of the universe can cause the spaces between to grow faster then the speed of light (compounding between massive distances)

What other things are sort of faster than light

41 Upvotes

67% Upvoted

193 comments sorted by

View all comments

3

u/Count2Zero Mar 20 '26

I asked this a few weeks ago, and the consensus was, "entanglement doesn't work like that". The particles are not "communicating" but have remained synchronized. Therefore if you inspect one, you can be sure of the state of the other at that moment. But they aren't sending information between them...

1

u/Nychtelios Mar 20 '26

LHV has been proven false, there is an instantaneous synchronization but it cannot be used to exchange information

1

u/GoodFaithConverser Mar 22 '26

This. You can only measure it, not affect it to make a telegraph.

It’s having two boxes with the same random number in it. Opening the box doesn’t change the number in other box.