Note
The alignment of Jupiter's four major moons in the book can never happen in reality. The three inner Galilean satellites are in a resonance with one other such that that whenever two of them are aligned with one another, the third one will always be non-aligned and quite often situated on the opposite side of Jupiter.
Heinlein also postulated that the surface of Ganymede was volcanic rock like the Moon. Subsequent discoveries have shown that Ganymede's crust is actually almost 90% ice or frost, covering a subsurface ocean.
Read more about this topic: Farmer In The Sky
Famous quotes containing the word note:
“There was a saviour
Rarer than radium,
Commoner than water, crueller than truth;
Children kept from the sun
Assembled at his tongue
To hear the golden note turn in a groove....”
—Dylan Thomas (1914–1953)
“There is a note in the front of the volume saying that no public reading ... may be given without first getting the author’s permission. It ought to be made much more difficult to do than that.”
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—William Shakespeare (1564–1616)