I'm working on a story that involves a lot of interdimensional travel, but I know little to nothing about building the physics of entire planets. All I know about this one particular planet is that its gravity is slightly lower than Earth's- just enough to allow the characters to do more intense stunts than would be possible on Earth.
One character has a sort of mini-jet that's designed similarly to a delta wing- small, triangular, and designed to go fast more than anything. At some point, he needs to take this jet through a rift that would land him on a much smaller planet, likely with much lower gravity and atmosphere density. How would this immediate change affect the plane? My first thought is that it would be unable to stay stable in midair and just plummet, but maybe its speed might counteract that.
I have tried looking this up through google, but all the websites I find include a lot of mathematical equations and specific physics and airplane jargon that I can't understand. My brain just refuses to comprehend algebra. Pretty much just explain this to me like I'm ten.