Sirus X was located in the Hercules Star Cluster
Unrevealed, possibly the Big Bang
Sirus X was the Homeworld to the Universal Church of Truth
The brothel ran by the female Slink, she was later named the Matriarch of the oppressive Universal Church of Truth
Strange Tales #178 (1975)
Sirus X was the Homeworld to the Universal Church of Truth, which was an oppressive religious empire ran by the future version of Adam Warlock, known as the Magus. Sirus X was inhabited by numerous extraterrestrial beings, from thousands of planets throughout the universe that had been converted to their beliefs.