Scientific Background
Conditions on Jupiter were not well known, although measurements of the planet's mass had revealed that it must consist largely of gases. Call Me Joe posits a surface at very low temperatures and exceptionally high pressures. Under these conditions water is a hard solid and methane a liquid, where both native and human-created life can survive. However, based on subsequent observations from space probes, it is believed (as of 2005) that the solid core of the planet is surrounded by regions of high pressure and temperature that would make any life, as we know it, impossible.
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