Telenn is a terrestrial exoplanet orbiting the K5V star HD 291784, discovered in 6-3804 by the Tallis Institute. Its discovery led to the groundbreaking recognition of the "Mirror World Phenomenon," as Telenn's position and characteristics remarkably mirror those of Halenn across the supermassive black hole NGC-7142α.
The Tallis Institute first detected Telenn during the Tallis Expansion Programme, initially cataloguing it as merely another habitable exoplanet. However, subsequent analysis revealed striking similarities with Halenn, including nearly identical mass (1.8 Earth masses), atmospheric composition, and orbital characteristics. Most remarkably, Telenn is positioned 4.3 light-years from NGC-7142α, precisely matching Halenn's distance on the opposite side.
This discovery fundamentally challenged existing models of planetary formation and black hole physics, leading to the establishment of the Mirror World Theory in 8-3805. The theory suggests that NGC-7142α's gravitational influence created a form of spatial symmetry during the formation of both stellar systems.
Like Halenn, Telenn hosts a sapient species remarkably similar to the Halennites, dubbed the Telennites. They share the distinctive crystalline skeletal structure and piezoelectric properties of their counterparts, though with notably different cultural development. The parallel evolution of such similar species across the black hole divide has become a central mystery in xenobiology.
The discovery of Telenn and its implications has profoundly influenced scientific thought and popular culture. The term "Telenn's Mirror" has entered common usage as a metaphor for unexpected symmetries in nature, while the phenomenon has inspired numerous works of art and literature across multiple civilisations.