Rao System

The Rao System is the planetary system that is home to the planet Krypton, throughout the various continuities and versions the system has varied significantly.

Celestial BodiesEdit

The amount of planets and celestial bodies varies greatly throughout different continuities, realities, and timelines. Post "Crisis on Infinite Earths" the planetary system was established as having seven planets within it.

The original story

  • Rao - Central body of the system, consistently portrayed as a red star giant. In some versions it is a red dwarf star.
    • Krypton - The only giant planet system, consistently habitable world portrayed in every version of the planetary system, home planet of the Kryptonians. Said to be the fourth planet from Rao in the "Earth-1" universe (pré and post infinite crisis).
      • Wegthor - Moon orbiting krypton in most continuities, in virtually all continuities the moon was destroyed by Jax-ur. The moon during its destruction apparently had a various bases colony kryptonian on it, the only moon planetoid that has atmospheric capacity and salt water, the size of the moon is Wegthor compared to the same size of Mars.
      • Koron - average moon, this moon has various minerals for the science of Krypton.
      • Xenon - Small moon of Krypton.
      • Mithen - Small moon of Wegthor.

Another parallel universe

    • Argo - Typically Argo in most continuities is a city on krypton, in "Superman The Animated series" (and accompanying DCAU tie-ins) it is a planet seemingly within the same orbit of krypton on the opposite side of Rao (the Superman Adventures comics state it is the fourth planet from the sun). It is inhabited by a humanoid people called the Argoans (old colonies kryptonians).
      • Blue Moon - Mentioned in the superman adventures comic as a moon of Argo.
    • Dheron - A planet found within "Earth-1" universe (post infinite crisis), is the fifth planet from Rao and is a habitable world with similar aspects to krypton, as well it has its own humanoid race the Dheronians.
    • Yur - Giant moon of Dheron
    • Colo - Second moon of Dheron
    • Thoron - The planet distant inhabited by old colonies Kryptonians in many ways having much of the same abilities the Kryptonians, the is story base of Earth 2 universe, the planet was destroyed by the shock wave of the explosion of Krypton, was Introduced in Superman # 80 (v1) and has no other known appearances.
    • Agoron - Moon Thoron.


The location of the solar/planetary system has varied dramatically from continuity to continuity. Sometimes the system is as few as 20 light years distance from earth in sector 2813, and other times in completely different galaxies. Every location will be listed here with the source material to avoid confusion as much as possible.

  • Atlas of the DC Universe - The red sun krypton orbits is located 50 light years away from the earth.
  • In Superman: Birthright - Krypton is a megagravity planet circling an M3 star in the Andromeda Galaxy.
  • In the Superman radio drama Krypton is from within our own solar system orbiting on the opposite side of the sun from earth.



  • The system is known as the Krypton System in the 21st issue of the Superman Adventures comic.

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