Terralysium
Terralysium was a planet in the Beta Quadrant, located fifty-one thousand light years from Earth. It was inhabited by Humans transplanted there by time traveler Gabrielle Burnham, who they revered as the Red Angel. ()

Astronomical data
The planet was class M and very Earth-like, but featured a complex intertwined ring system composed of radioactive particles. ()

It had a mean radius of 3958.8 miles, an equatorial radius of 3963.2 miles, and a polar radius of 3949.9 miles. Its circumference was 24901.461 miles, and it had a surface area of 196,940,000 square miles. Its density was 5.514 g/cm3 and its gravity was 9.807 m. Its surface temperature ranged from −69.2 to 56.9 degrees Celsius. ()

History
In 2053, the planet became home to several hundred Human refugees transported from Earth, who had been saved from World War III by a mysterious angelic being. Believing that Earth had been destroyed in the war, the inhabitants developed a religion cobbled together from the primary faiths of Earth and also incorporated their enigmatic savior. They were technologically limited and eventually lost the use of electricity for a period.

Over the next two centuries, the planet's population grew to roughly eleven thousand, spread across ten settlements including New Eden and northern territories. In 2257, the  visited Terralysium while investigating a red burst. Though the burst itself had disappeared by the time they arrived, they were able to prevent radioactive debris from one of the planet's rings from causing a nuclear winter on the surface, which would have constituted an extinction level event.

Captain Christopher Pike decided that, despite their being Human, the inhabitants of Terralysium constituted a pre-warp civilization and were subject to General Order 1. He thus did not reveal the existence of Discovery to them, save for one man named Jacob who had already learned the truth in exchange for a camera that had recorded the church's transport to the planet. ()

At the end of the Battle near Xahea later that year, Discovery traveled through a wormhole to the 32nd century with Terralysium as their physical destination. A red burst, observed at Terralysium 124 days later, seemingly confirmed their safe arrival. () However, neither the Discovery nor Burnham herself actually arrived at Terralysium when they reached the 32nd century. ()

In 3186, Gabrielle Burnham built herself a home base on the planet, being careful to not use any pre-existing technology so that Control could not find her there. She found that the Humans she had transplanted to the planet were thriving, from which she concluded that the future could be changed. ()

After arriving in 3188, Michael Burnham sent a transmission to Terralysium to determine what had happened to her mother. It took months to get a response, and no one there had heard of Burnham's mother. Upon being reunited with the Discovery, she reported on Terralysium's status to Commander Saru. () Instead, Gabrielle was sent to Essof IV. ()

Inhabitants

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Appearances

References

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Planets
Colonies