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Thank you guys for the tips!

@jbstanhope

In a symmetrical sphere, the gravity gets weaker the closer you get to the center. At the center the gravity is zero. Gravity will always pull toward the center, so if you were passing through the center, gravity would change directions. (If you want more details look up Newton’s shell theorem). Your planet is not spherically symmetrical because of the holes but I think if the holes were approximately evenly distributed it should be approximately correct.

So basically, if one were to fall on this holey planet, they would be in a mini orbit through the planet and around its core? in an asymmetrical planet, would there still  be no gravity at the planet’s center? Or would it be in patches all over the planet? What if the zero-gravity area was full of water and the external gravity was all that was keeping the water in the no-gravity zone?

I like the idea of the gravity train! What do you think would be a good amount of time for it to take?

@rusted-knight

Yeah, I was thinking that a super heavy material for artificial gravity would only work on a space station or something like it where people live. I also just wondered what would happen if it ever wore out, would people unwarily step on no-gravity zones and float?

Is there a lot of friction to travel through in space? what if there were tunnels people built as interplanetary highways?

I definitely was thinking that ships that regularly go onto planets would be zero-gravity… maybe there’s be large ships that are only in space that travel horizontally? I was thinking there’d be large transit ships for going between planets that would go at very high speeds, almost like trains in space.

Also, do I need to worry about aerodynamics in space? Would I need to worry about it on low-gravity planets?