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After reading some Planetary, references are made to other groups that apparently actually have written works (The Authority, S.T.O.R.M. Watch, etc.). After doing some more reading about the universe, it's a nice and confusing twist of ownership, imprints, and universes.
What comics officially share a universe with Planetary (both past and present, as I understand some things have been exchanged and made part of reboots and such)?
Warren Ellis' Stormwatch and Authority runs (pre New 52) definitely do. Stormwatch and Authority both feature Jenny Sparks, who was born on January 1, 1900 and is a Century Baby like Elijah Snow. The Authority later stars Jenny Quantum, Sparks' heir for the 21st century. The Authority's base of operations, a Shiftship, is also featured prominently in an issue of Planetary.
The DC Wiki designates entries on all of these characters with Earth-50, and gives a list of the titles that are designated as taking place there. That's probably more or less accurate, but seeing as how "Earth-50" started out being owned by Image and then went on to become WildStorm for DC, it's probably not as cut and dry as that list. I would be inclined to say that only the Earth-50 series that directly reference Planetary are canon (those being Authority and Stormwatch).
Wildcats is set in that universe as well.
