News for hackers. Stuff that matters.

A comment on The horizon problem for faster than light travel. Parent comment

Re:The horizon problem for faster than light travel by yumraj on Thursday January 20, 2022 @06:59PM (#30017229)
> Faster than light travel and time travel are both fundamentally impossible in our universe and can't be achieved.

That may very well be, and true in our lifetime, but given how little we know about a lot of things, and that in many cases we don't even know what we don't know, I would hesitate in making an absolute statement.

[ Parent | on HN ]
Re:The horizon problem for faster than light travel by willis936 on Thursday January 20, 2022 @09:25PM (#30018438)
It's been proven rather thoroughly though. Look at Kip Thorne's body of work. His book: Black Holes and Time Warps is accessible.

c0 is the speed of light only incidentally. It is the speed of causality first. You can warp spacetime but you can't change the speed limit.

You might think there would be a hypothetical way to cheat it from some unknown phenomenon, but then any occurrence of that phenomenon would destroy itself in zero time.

[ Parent | on HN ]