Hacker News Reader

Comment by pontifier | Hacker News Reader

I believe there's a directionality component that happens when you fall into a black hole as well. The directions out of the black hole begin to constrict into a point above you, while directions that end at the singularity become more and more spread out, until every direction leads to the singularity as you cross the event horizon.

Edit: this Forbes article describes this effect. https://www.forbes.com/sites/startswithabang/2018/01/19/what...

View on HN

Yup. But if you're a free-falling point-like observer then you won't be able to find this out. You'll only discover this if you try to send a signal out or fire your ship's engines.

And of course, at some point the tidal forces would be so large that any non-point-like observer would be torn into pieces.

The possible directions that you'll see actually become constricted to a line, not a point. It's essentially a projection of the time axis. That's because in a classical theory singularity exists as an infinitely long time-like line. As you fall down, you can influence the location where you hit it a bit if you fire your ship's engines.

But anywhere on this line the gravity (curvature) is still infinite so it's not like you'd be much better off.

It's not every direction that points into the singularity inside the event horizon. It's time itself that points to the singularity, hence why it's inevitable to fall into the singularity in a Schwarzschild BH.

Reply on news.ycombinator.com