Note: Krypton (Kr) is the 36th known element and one of the "noble" gases reputed for its brilliant green and orange spectral lines. It was discovered in 1898 by Scottish scientist Sir William Ramsay and his assistant Morris W. Travers in the residue left after liquid air had nearly boiled away.

Krypton is an odorless colorless non-toxic gas present in Earth's atmosphere in small amounts of about 1 part per million.

Krypton is used in certain photographic flash lamps for high-speed photography. Uses thus far have been limited because of its high cost.

Nick Name
Indigenous Inhabitants
Immigrant Inhabitants
Dimension or Galaxy

Rao system in the Milky Way Galaxy of the Earth-1 Dimension, about 50 light-years from Earth.

Notable Cities

Antarctic City

Argo City

Atomic Town

Bokos Island




Vathlo Island


Notable Structures, Monuments or Natural Beauties

Ancient Ruins of Xan

Dandahu Ocean

Fire Falls

Glass Forest

Gold Volcano

Jewel Mountains

Meteor Valley

Mundru Mountain

Rainbow Canyon

Scarlet Jungle

Three Sisters of Krypton

Notable Residents

General Dru-Zod



Kal-El (Superman)

Kara Zor-El (Supergirl II)

Lara Lor-Van


Kryptonite: Radioactive element created by great pressures within the core of Krypton.

Neighboring Planets or Celestial Bodies

Rao (sun)

Mithen (moon)

Thoron (planet)

Wegthor (moon)

Xenon (Possible former moon that spun out of Krypton's orbit.)

Note: There may have been another four unnamed planets in the Rao system. The sun Rao has also been designated Negus-12.

Regularly Appearing

Action Comics

Superman Vol. 1 & 2

Adventure Comics

Adventures of Superman

Superman: The Man of Steel

World of Krypton

First Appearance

Appeared Unnamed

Action Comics #1 (June, 1938)


Superman daily newspaper strip (Jan. 1939)

Named in Comics

Superman Vol. 1 #1 (Summer, 1939)

Jerry Siegel & Joe Shuster


Created by the gaseous race of beings known as Sun-Thrivers, who created and dwelled within a giant red sun by drawing matter from other parts of the galaxy. Because of instability in the sun the beings created planets from the solar matter to maintain a stable system, one of which was the giant Krypton. Eventually the planet would grow unstable with age and detonate.


A planet roughly the same size as Earth orbiting a red dwarf star, Krypton originated like many planets do, but it was destined for eventual destruction.

Life evolved on Krypton like many other planets through strife and conflict. Eventually Kryptonians would achieve a level of social and scientific achievement that caused them to grow introspective at the cost of evolution and emotion.

The chain reaction that caused Krypton's ultimate destruction is unknown, but it resulted in a new deadly radioactive element known as Kryptonite.