The United States Space Ship Ticonderoga is the largest space vessel ever built. Constructed over 500 years ago, it now orbits earth, most systems shut down - It is a treasure ridden derelict juggernaught.
A leftover relic of the ancients.
Or so would seem.
A collection of space habitats, space stations, space colonies, and anything else artificial that serves as a home to humans in SPAAAAAAAAAAAAAACE!
Here am I, floating in a tin can, far above the moon, Planet Earth is blue, and there’s nothing I can doo.
A salvage and scrap yard of the UFP
A secret MLM (pyramid) company that offers eternal life, but in fact it transfers the life forces of its members to those position "above". If you get high enough, (meaning you get enough new members) you start to enjoy the benefits. Maybe a willing sacrifice is much more effective for the transfer. But no one says, that a suddenly unwilling member, threatening to tell the authorities, may not loose it involuntarily... thus start people to vanish, and aged corpses are deposited somewhere safe.