Acheron
From AvP Online Encyclopedia
LV-426 is one of three known moons orbiting a gas giant located in the Zeta Reticuli system, 39 light years away from Earth. The moon is christened by human colonists as Acheron. It is more than likely a reference to the branch of the river Styx in Greek mythology.
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Before The Terraforming
LV-426 was described as being almost primordial. It's atmosphere consisted of inert nitrogen, a high concentration of carbon dioxide crystals and methane. The moon was highly unstable with volcanic activity. The main crust of the moon was formed mostly out of igneous rocks with a surface temperate of absolute zero. Needless to say, LV-426 was inhospitable to human life.
Being so primitive, LV-426 wasn't capable of supporting any forms of life. It had no indigenous life. The moon was home to a crashed alien derelict vessel, however. It's relationship to the planet is unknown. There may have been a Space Jockey base at one point or it was the homeworld of the Alien eggs the ship carried in it's cargo hold.
Terraforming LV426
By 2179, Acheron was the home to Hadley's Hope, a human colony. Before this the atmosphere of the small moon was completely change so LV-426 was capable of supporting human life. The process of actually terraforming Acheron took around a decade and required the building of thirty atmosphere_processor which would replace the dangerous gases in the atmosphere with oxygen and hydrogen.
After the atmospheric processors had successfully created an atmosphere in which humans could live, Hadley's Hope was constructed and the colonists moved in. Even though the planet was now habitable, it had ravenging winds and a rocky surface. More than a century after it's discovery, the derelict ship was still there, located beyond the Ilium Range. It had been damaged due lava and volcanic eruptions but it was still there. It was found by the colonists and soon the colonists became infected and Hadley's Hope was overrun.
After a squad of Colonial Marines attempted to rescue the colonists of Hadley's Hope, they inadvertently damaged one of the atmospheric processors. It exploded with a force of 40 megatones, vaporizing an area the size of Nebraska. The twenty nine atmospheric processors remained stable.
The Future
The loss of a single atmospheric processor didn't damage the moon. It was still very capable of supporting human life and the derelict ship remained intact. In 2189 Weyland Yutani had set up and established a second colony built around the derelict ship. The colony was a research station which studied the Aliens contained within the derelict ship. It was later destroyed by a marine attempting to escape the colony which had since been infested by Aliens which escaped from contamination when the marine accidently caused a second atmospheric processor to explode.
This information is from the game Aliens vs Predator and should not be considered canon.
