system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What would happen if you tried to land on a small Gas planet?

I know gas giants are made of nothing but gas, and have no solid surface. But what would happen if you were to hypothetically try to "land" on one? 

You would obviously never hit the surface, but what would happen as you neared the core? 

I understand that this is pretty much impossible for any existing spacecraft or probe to do for a variety of reasons, but lets say it is done in a vehicle impervious to damage. What would I see as I descended? What would it be like as you approached the core of the planet? Would you hit gas as dense as a solid?
gpt
We don't really know the inner structures of gas giants, but they're thought to have solid or liquid cores. Usually, this would be any inner core of heavy elements and an outer core of liquid metallic hydrogen, but the behaviour of matter at those temperatures and pressures isn't really known. 

They're not all gas all the way through.