system
Given the following post, respond as if you're commenting on Reddit:
human
[PORTAL] If you put one portal on the ceiling, and one portal on a tiny asteroid, would the gravity of Earth pull nearby objects into the asteroid portal?
gpt
I don’t think that gravity is conducted (for lack of a better word) though portals.  

Put two portals on the floor so that jumping down into one would have you jump up from the other as you went through. If gravity was transmitted, then the two gravities interact and cancel out leaving you floating at the portal horizon. But what actually happens is your momentum is maintained and you bob up and down as you switch instantaneously from one gravitational field to the other.