[JumpCrisscross]

> don't know what happens if 1 mass is negative , but to me it's not obvious that they still attract

The physics of negative mass/energy are paradoxical to the point that they mathematically enable transluminal transport.

[daxfohl]

But are they more paradoxical than relativity itself?

[JumpCrisscross]

> are they more paradoxical than relativity itself

I think so. For most purposes, we can build intuition for special relativity without having to do the math. (General is more fucked.) We don’t understand negative energy/mass enough to even do that.