Gas Giant

Gas Giant planets are seas of liquid gases, containing several floating islands. Air is only present in the upper layer of the planet. Just below rests a sea of random liquid gas. The core of a gas ball is usually a sea of a random liquid, anything from Lava to Healing Water can be found there. The core may or may not be minable.

They are the only places where one can acquire Metallic Hydrogen outside of a lab, and in large quantities.

Do not attempt to explore until properly equipped!

Codex Description

 * A gas giant with enough mass to allow exploration. Take extreme caution wandering here. Recommend: Extreme Pressure Protection.
 * A gas giant swirling with massive storms and chemical clouds. Fatal danger is present here. Recommend: Extreme Pressure Protection.
 * Whirling colors and thick gas circle this gas giant. Recommend: Extreme Pressure Protection.
 * A deadly but wonderfully unique gas giant with enough atmosphere to explore.Recommend: Extreme Pressure Protection.
 * While it has almost no ground to speak of, a gas ball can yield useful resources. Recommend: Extreme Pressure Protection.
 * A gas ball with enough atmosphere to provide access to valuable resources. Recommend: Extreme Pressure Protection.



Exploration
Although, with the exception of its Surface layer, the Gas Giant has no dangerous creatures, a gas ball is quite dangerous to navigate on:


 * Firstly, it applies the Extreme Pressure debuff, which require some mid to late-game armor to resist (such as the Phase Armor or Valkyrie Armor), and the Hunted debuff, which spawns in ghosts that operate similarly to the Erchius Ghosts found on moons but are capable of draining both health and energy when in range.

If you are ready, though, it is a true treasure hoard of infinite gases, some which are not found anywhere else!
 * Then, as its only solid ground are medium sized floating islands, similarly to vanilla asteroids you should bring a way to fly around safely to avoid falling to the extremely hard core of the gas planet. Such as one of FU vehicles, a Spear with the Rocket Spear ability (such as Flightfire or Irradium Spear), or a Staff with the Repulsion Zone ability. A grappling hook can be useful for the extremely high gravity. The Gravity Wand will work wonders here. An Emergency Teleporter is almost certainly a must-have if you are playing on survival or hardcore.
 * Monsters are usually not a concern on Gas Giants. The biggest and scariest of them (Gas Bag and Sky Whale) are not hostile at all: they won't pursue you unless you damage them first. If you do, they are incredibly strong. Gas Bag is capable of destroying blocks and violently self-destructs when defeated.
 * Finally, you should be able to resist all harmful gases, as it is likely that not all randomly generated gases are going to be harmless. Again, the Phase Armor can be useful, but there are a few gases such as fire that the set will not resist. Useful EPP Barriers: Poison, Fire, etc.

Resources

 * Minerals :These planets contain small patches of variety of resources: Trianglium Ore, Irradium Ore, Telebrium Crystal, Densinium Ore, Prism Shard, Solarium Ore, Crystal Erchius Fuel, Effigium Ore
 * Gases : Gases/liquids are also found in plentiful amounts, as there are usually 3 to 4 layers of different randomly generated layers of gases, such as: Helium-3, Caliginous Gas, Bio-Ooze, Metallic Hydrogen, Nitrogen, Hydrogen.
 * Core: The core might have an infinite ocean of Lava, or Healing Water, or (very rarely) Liquid Erchius Fuel.

Trivia

 * Surprisingly, you can perform Terraforming on Gas Giants like on any other planet, which doesn't really make sense. Terraforming a Gas Giant will not add any solid blocks to it, so what you will get in the end is a Gas Giant with background and floating chunks belonging to other planet type. The only practical benefit of terraforming a Gas Giant is the removal of negative effects and hostile fauna. Well, you can also do it purely for aesthetics.

Variants
Gas Giants have 5 variants: normal (see below), Proto Giant (with additional Proto-Poison hazard), Flame Giant (with Extreme Heat), Ice Giant (with Extreme Cold) and Toxic Giant (with Mercury Poison). They are very similar (and the navigation console will show them all as "Gas Giant"), but their floating rocks are composed of different blocks.