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Krypton's Red Sun

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Krypton Exploding

Krypton was a planet deep in space. It was destroyed sometime in the 1940s because it exploded.[1]

It's the homeworld of Kryptonians such as Jor-El, Lara, Kal-El (aka Superman), the Kandorians, Zycree, Logar, Hul, Rom-lok and strange dragon type creatures.

When Superman met Krim for the first time, he told him he was also from another planet: Krypton. Krim was familiar with the planet, telling him he had heard of it: "the planet that exploded."[2]




A volcanic eruption on Krypton.[3]



Indigenous species

Krypton (the green planet in the center) and other planets in the Rao system.[4]


The Planet Krypton, shortly before its' destruction.[5]

Krypton, as seen from outer space.[6]


For centuries the people of the planet Krypton has been a technologically advanced culture, with a Science Council acting as the head of government. Although space travel was outlawed on Krypton due to an incident involving Jax-Ur stranding the Council in space, the people still continued to advance in science.

Several weeks before Krypton’s impending doom, the planet was ravished by minor quakes. One quake was bad enough that Jor-El and the rest of the Kryptonian Science-Council were summoned together. Jor-El has the councils' support, as he warns them of the instability at the planets core and the coming doom, until he suggests to the council that they authorize the building of ‘Space-Arks’ and send them to the newly discovered Earth, he loses their confidence. This troubled the rest of the council because they know as does Jor-El that due to Kryptonian law, there is a ban on building ships for the purpose of space travel and exploration. Ka-Do also angrily reminds Jor-El about the rogue scientist who 20 years before wanted to exile the Ruling Council into space. Ka-Do then tells him to leave immediately.

Discouraged, he leaves. He and his wife Lara immediately begin building a rocket-ship.[7] A few weeks into the building of the ship, Lara realizes that it will only fit two. Jor-El tells her that there isn’t time to build a larger ship.[8]

Jor-El repeatedly went before the High-Council to warn them of the danger. They would only laugh at him. And one council member told him that he was through listening to his "nonsense."[9]

A few weeks later, the Kryptonian date is 5752.8.[10] Jor-El is once again warning the High-Council about their impending doom. Their Sun, Rao is unstable and expanding,[11] they should order an immediate evacuation. They laugh him right out of the building.[12]

That same afternoon, the Science-Council, summons Jor-El. They tell him of the council’s decision to disbar him. Moments later, the planet begins to quake for the last time. Jor-El rushes to his lab, where Lara and young Kal (as he called him) are waiting. They put Kal into the ship and as Jor-El tries to get Lara to go she refuses and tells him that her place is by his side.[13] So, they send him to Earth an orphan from parents and planet.


Krypton was apparently geologically unstable, which is why it eventually exploded. This was in part caused by the expansion of Rao, which apparently had a major effect on Krypton's atmosphere and in turn the core below the surface of Krypton.

Krypton was much larger than Earth, which is why its' gravity was so much stronger.[14] In fact, one chunk of Krypton that made its' way to Earth, nearly colliding with it, was the size of an average planet, indicating that Krypton must have been enormous.[15]


  1. As established in multiple episodes.
  2. As seen in The Balloon People.
  3. As seen in The Menace of the White Dwarf.
  4. As seen in The Menace of the White Dwarf.
  5. As seen in the opening theme of The New Adventures of Superman.
  6. As seen in the opening theme of Superman.
  7. Young Kal-El’s ship was called a ‘rocket-ship’ by his father Jor-El, in the Season 1 episode, The Planet-Splitter.
  8. Summary from Season 1 (1973) episode, The Planet-Splitter.
  9. From Season 3 (1978) episode, Secret Origins of the SuperFriends.
  10. From the 1983 Shorts: The Krypton Syndrome.
  11. Apparently Rao was going supernova and the cosmic radiation disrupted Krypton internally, causing it to experience core instability.
  12. From the 1983 Shorts: The Krypton Syndrome.
  13. From Season 1 episode, The Planet-Splitter.
  14. As told in The Planet-Splitter.
  15. As seen in Will the World Collide?.
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