3.7 Class Y Demon & Comparative Sizes / Planetary Evolution

Reference data for the Class Y Demon planet with a note on the hostile classes X, Y and Z, followed by a comparative sizes and planetary evolution diagram showing class relationships across the hot zone, ecosphere and cold zone.

Class Y Demon planet, a turbulent red world saturated with toxic chemicals.

Comparative Sizes and Planetary Evolution diagram: planetary classes arranged by size around a central star (Class J) across the cold zone, ecosphere and hot zone, with evolution arrows (A to C; E to F to G) and a key showing classes P, K, L, M, O and N, extending to the cometary halo (Oort cloud).

Class Y — Demon

Age: 2-10 billion years
Diameter: 10,000-50,000 km
Location: Hot Zone/Ecosphere/Cold Zone
Surface: Temperature can exceed 500°K
Atmosphere: Turbulent, saturated with toxic chemicals and thermionic radiation
Life-forms: Mimetic (Delta Quadrant)

Classes X, Y and Z are reserved for planets with environments particularly hostile to humanoid life.

Comparative Sizes and Planetary Evolution

A diagram arranged around a central star shows the relative sizes of the planetary classes and how they evolve across the hot zone, ecosphere and cold zone, from the star outward to the cometary halo (Oort cloud).