Hadean

Hadean, or Hadeen, is the star at the center of the Hadean System, which counts Cybertron among its planets.

Fiction

Animated cartoon

Hadeen was a star orbited by many planets, most of them colonized by Transformers. The AllSpark Almanac II

The Covenant of Primus

During the Age of Evolution, a swollen red star passed through Cybertron's solar system. Its gravity field caused Cybertron's star to eject violent solar flares that roasted the metallic planet, causing the Great Cataclysm. The Covenant of Primus

Beast Wars: Uprising

Hadean was visible in the sky for Lio Convoy after his encounter with the MCSF. Broken Windshields

2019 IDW continuity

During the War of the Threefold Spark, Exarchon managed to usurp the Titan Croaton. Citadel managed to destroy Croaton's body, leaving the shattered remains of his corpse to drift around the sun, forming the Croaton Cloud. Wheeljack: Orbital Decay

When Vigilem severed the Tether, The Change In Your Nature Part Five the Winged Moon spun off towards the sun. All Fall Down Wheeljack's team of engineers managed to vent enough pressurized energon that pushed the Moon out of the sun's path. Wheeljack: Orbital Decay

Notes

• The star gets its designation from Simon Furman's unofficial novella, "Alignment", which mentions the "Hadean system". The name presumably comes from the Hadean eon of Earth's geological history or its etymological root of Hades, a name describing the underworld and its ruler in Greek mythology.