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The basic idea of the Ganymede Hypothesis is not complicated and could be explained in one or two paragraphs if somebody really wanted to.

The thing about the four bodies with the rough 26 degree axis tilts (Saturn, Neptune, Mars, Earth) says to assume they were captured as a group. The sun, Mercury, and Jupiter with axis tilts under ten degrees should be assumed to have been an original basic system. That says that our system was originally a dual system with a very bright part to the North and a very dark part (Earth, Mars) inside that Saturnian plasma sheath to the South. The old creatures of the Earth (Hominids, dinosaurs, lemurs, tarsiers...) all had the same huge dark-world eyes; humans and dolphins with the smallest relative eye sizes of advanced creatures should be assumed to have originated within the bright Northern part of the system. Ganymede, for a number of reasons, would have amounted to an ideal home world for humans and dolphins at that time.

If I wanted to make two paragraphs out of it, I could mention the fact of humans being aquatic mammals (Elaine Morgan's aquatic ape thesis) despite there being no fossil evidence of any kind of an aquatic ape on earth and there never having been a body of water on earth which would be safe for humans to live in. Ganymede, it turns out, would have been a freshwater ocean world some tens of thousands of years ago with both anchored islands and floating bergs of pumice with luxuriant vegetation. The ultralow moment of inertia of Ganymede is due to a deep outer mantel of pumice and not salt water as is commonly claimed.

An original human world would need to be:

1 Bright (the relatively tiny human eyes)
2 Wet (the aquatic adaptations which Morgan mentions) and
3 Safe (both from sea monsters and from cosmic radiation)

Some tens of thousands of years ago, Ganymede had all that.

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