system
Given the following post, respond as if you're commenting on Reddit:
human
Do gravitational fields travel through Portals?

If I were to place a portal on my kitchen floor and another on a neutron star, how would this affect the planet? 

Can you use the portal gun on Black Holes?
gpt
If you place a portal on a wall, another one on a ceiling and you stand near the one on the wall, you won't be "attracted" by the gravitation of the ceiling one so i tend to think that gravitational force doesn't travel through portals.

However, pressure difference can travel through portal (like the scene when Chell put one on the moon) so if you put a portal on a neutron star this may not be good for your kitchen..