Planet 4546B

Planet 4546B is located in the outer reaches of the Ariadne Arm, orbiting around the star 4546. The “B” means that 4546B was the first planet discovered around the star 4546 (or 4546A). There are at least ten other celestial bodies in the system, each of which is larger than Earth's Moon.[1] Planet 4546B itself is a water planet smaller than Earth[2] with a breathable oxygen-nitrogen atmosphere. It also harbors two moons, one being very close to the planet, causing frequent solar eclipses.

Planet 4546B may be based on the real-life planet Gliese 1214B, as both appear similar in appearance, and are both "water worlds".

There are three known major ecosystems on the planet: the Crater, Sector Zero, and the Dead Zone, the latter of which covers the majority of the planet.

The known planet is almost completely covered in water, except for a few islands, and features a variety of submerged biomes. The Aurora is located a few meters above the surface, in relatively shallow water.

The Crater features a full ecosystem of flora and fauna. However, this is only a very small area of the planet, located in a dormant volcanic crater, approximately 2km in diameter. The Arctic supports a nearly completely different ecosystem, harboring more creatures and plants adapted to the colder temperatures. The rest of the ocean is known as the Crater Edge, it is extremely deep and nearly devoid of life, supporting only microscopic life forms, and Leviathan Class Organisms. It is unknown whether any similar areas of life exist elsewhere other than the Crater and Sector Zero.

Architect and PDA data make note of high thermal activity from the planet's core. This is evidenced by the Inactive Lava Zone and Lava Lakes, respectively. The Architects took advantage of this feature, installing the Alien Thermal Plant within the Lava Castle, which allowed the generator to harness the planet's natural thermal energy