Abell is a small agricultural colony of the UNSC that used to be a large industrial planet. After a cvil conflict several nuclear factories were lost in the process causing the atmosphere to be filled with large amounts of nuclear radiation. Causes of the war was a civl uprising due to the terrible conditions that the grunt workers were put in. Being busy with the Covenant the UNSC had no call in this situation. The damage dissolved both factions and the UNSC had lost hold of the planet. Decades later survivors of the conflict banded together to form small groups of farming communities.