Gas Giants
The Universe's Most Intense Worlds
Gas giants are massive worlds made mostly of hydrogen and helium, like Jupiter and Saturn in our Solar System. But the ones orbiting other stars can be wildly different—some scorch close to their stars, others drift alone in the void. These extreme planets teach us how massive worlds form, migrate, and survive (or get destroyed) in alien systems.
From puffy balloons inflated by heat to rogue worlds with no sun, they’re the most dramatic exoplanets we’ve found so far.
- Much larger than Earth—10–20× Earth radius common
- Extreme temperatures: some hotter than lava, others frozen
- Wild weather: winds up to 5,000 mph, glass rain, iron clouds
- Many are “puffy” from heat—lower density than cork
- Some are rogue planets—wandering without a star
- First exoplanets ever discovered were Hot Jupiters
Gas Giant Codex
Size:
8.4 × Earth
Distance from Earth:
245 light-years
Habitable Zone:
Maybe
Star Type:
K-type
Fun Fact:
This real Tatooine world orbits two stars and was the first confirmed circumbinary transit planet!
Size:
10.5 × Earth
Distance from Earth:
211 light-years
Habitable Zone:
No
Star Type:
K-type
Fun Fact:
JWST found photochemical SO2 and a methane inventory depleted by orders of magnitude!
Size:
14.3 × Earth
Distance from Earth:
698 light-years
Habitable Zone:
No
Star Type:
G-type
Fun Fact:
JWST spotted a huge carbon-dioxide fingerprint in this puffy Saturn-mass atmosphere!
Size:
14.1 × Earth
Distance from Earth:
50 light-years
Habitable Zone:
No
Star Type:
G-type
Fun Fact:
This hot Jupiter races around a Sun-like star in just over four days, the first such world ever found!
Size:
20.8 × Earth
Distance from Earth:
634 light-years
Habitable Zone:
No
Star Type:
F-type
Fun Fact:
This ultrahot Jupiter is so scorching that iron can vaporize on the dayside and rain down at dusk!
Size:
8.3 × Earth
Distance from Earth:
359 light-years
Habitable Zone:
No
Star Type:
M-type
Fun Fact:
This giant world circles a cool red star while a white dwarf companion watches from far away in the same system.