system
Given the following post, respond as if you're commenting on Reddit:
human
Considering its solid core, why is Saturn referred to as a gas giant rather than a rocky planet with immensely thick atmosphere? Can you "fly through" a gas giant?

Than you for your time and answers.
gpt
Our gas giants are referred to as gas planets because the vast majority of their mass is composed of materials found as gas on Earth.

In reality all four have large non-gaseous regions in the center.  

Jupiter and Saturn are large enough that the pressure increases steadily until the hydrogen enters a supercritical state and behaves more like a molten metal than a gas.

Uranus and Neptune are smaller and colder and likely have pressurized water-ammonia "seas" deep beneath the clouds.

So no, you could not fly through them.

In our solar system there's a clear difference between rocky planets and gas planets since there's a huge mass jump from Earth to Uranus.  We've never observed a planet in the 5-10 Earth mass range to see how it behaves.