By habitable worlds I mean worlds where humans from Earth could live without spacesuits or airtight enclosed habitats.
The creator of this website attepted to build the ultimate solar sytem, a scientifically plausible one with the greatest possible number of habitable planets.
In old science fiction stories from the pulp era it was common to depict our solar system with at least three habitable worlds, Venus, Earth, and Mars, and there were sometimes stories and series with many more habitable worlds.
So which story, series, movie, tv show etc. depicted the solar system with the most habitable worlds, to compare with the supposedly scientifically plausible "Ultimate Solar System"?
Edit 9:58 PM July 4, 2015 I should have added NATURALLY habitable worlds.
For example, in Jack Williamson's Legion of Space stories the solar system has been terraformed to have countless habitable worlds. Even many small moons and asteroids have had breathable atmospheres created, and those atmospheres are kept from floating away into space by artificial gravity fields which also give a feeling of normal gravity.
So in that story hundreds of thousands of objects in our solar system could have been terraformed and colonized.
Edit 10:14 PM July 5, 2015 And in the future it may be possibly to build countless millions of ARTIFICIAL habitats in space out of asteroids, comets, Trans Neptunian Objects, and smaller moons. For example, for each trillion (1,000,000,000,000) Humans living in habitats with average populations of 10,000 to 100,000, there would be 10,000,000 to 100,000,000 space habitats.
So the number of NATURALLY habitable worlds in our solar system in any science fiction story is likely to be very much smaller.