According to Isaac Asimov's Foundation and Earth, Galaxia is (or will be) a living organism which contains all the lifeforms and rocks and other materials in the galaxy. It is a Utopia, the successor of Gaia (similar being encapsulating only one planet). Isaac Asimov (courtesy of Jay Kay Klein) Dr. Isaac Asimov (c. ... Foundation and Earth Foundation and Earth (1986) is a science fiction novel by Isaac Asimov, the fifth novel of the Foundation Series and chronologically the last in the series. ... Utopian, in its most common and general positive meaning, refers to the human efforts to create a better, or perhaps perfect society. ... Gaia is a fictional planet described in the book Foundations Edge, by Isaac Asimov. ...

One important point should be made about the 'inevitability' of Gaia's transformation into the galaxy-encompassing Galaxia, thus becoming the final evolution of the Second Galactic Empire:

Repeatedly throughout The Foundation Series, short excerpts are given from the Encyclopedia Galactica, which is an encyclopedia that contains all (or most) human knowledge. The date given for the edition of the Encyclopedia Galactica that these excerpts come from is 1,020 years after the Foundation is founded; during the Second Galactic Empire. Hari Seldons holographic image, pictured on a paperback edition of Foundation, appears at various times in the First Foundations history, to guide it through the social and economic crises that befall it. ... The Encyclopedia Galactica is a fictional or hypothetical encyclopedia of a future galaxy-spanning civilization, containing all the knowledge accumulated by a society with trillions of people and thousands of years of history. ... In Isaac Asimovs Robot/Empire/Foundation series of novels, the Galactic Empire is an empire consisting of planets settled by humans across the whole galaxy. ...

From Foundation's Edge it can be surmised that Galaxia culminates in about FE 4000, allowing for further Foundation stories to be interesting until that date, if the Estate of Isaac Asimov were to authorize further stories (Vis-a-vis Donald Kingsbury's novel, Psychohistorical Crisis). However, it is noted by R. Daneel Olivaw in Foundation and Earth that it would take several more centuries to bring Galaxia about. Foundations Edge Foundations Edge is a novel by Isaac Asimov, the fourth book in the Foundation Series. ... Donald Kingsbury (born 1929) is a science fiction author. ... R. Daneel Olivaw is a fictional robot created by Isaac Asimov. ... Foundation and Earth Foundation and Earth (1986) is a science fiction novel by Isaac Asimov, the fifth novel of the Foundation Series and chronologically the last in the series. ...

As an alternative, the end of Foundation's Triumph suggests that the second Galactic Empire may incorporate Galaxia, rather than the reverse. Foundations Triumph (1999) is a science fiction novel by David Brin, set in Isaac Asimovs Foundation universe. ...