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The majority of the nebula is controlled by the Ecumene, a civilization native to one of the nebula's oldest stars, Arachosia. These systems are almost unreachable to the inhabitants of the rest of the Gigaquadrant, and may only be accessed by a network of wormholes that entangle the nebula with other massive bodies, such as galaxies. It began forming stars around 5 billion years ago, and due to the nebula's richness in heavy elements, gave rise to numerous planetary systems. The Triffid Nebula itself is one of the countless smaller dust clouds hurled away from the galaxy by the immense tidal forces of the galaxy's mass.
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A huge quantity of debris from this collision formed the "Great Ecliptic", a ring of gas and dust that orbits the galactic center at a steep incline above the galactic plane. Around 6-7 billion years ago, a smaller galaxy fell into the gravitational well of the Phradox Galaxy and was subsequently absorbed into the galaxy's larger mass. Nevertheless, it is a fact that at least two Fragments - Iridium and Chromium - founded settlements and cut contact with the Cluster. The Triffid Nebula (not to be confused with the region in the Milky Way Galaxy with an identical name) is a star-forming region which was once part of the Phradox Galaxy. It is unclear if the Chroniclers only spread those numbers to keep up the continuity of the number two and its powers (22 4, 23 8, etc.), an important foundation of their numerology.