Jupiter was once considered a possible haven for life.  Although the planet is gaseous in nature, it was thought that the swirling clouds of gas that appeared to contain significant traces of water vapor, ammonia, methane and other compounds, would be ideal conditions for life to evolve.  The upper cloud layers were thought to be warm enough, cool enough, calm enough, and have an ample supply of lightning to supply the energy necessary to provide the "spark of life".

Expectations remained high until the Galileo Spacecraft launched a probe into Jupiter's cloud tops.  The results were spectacular in terms of the data collected, but a disappointment to life-scientists.  Jupiter's clouds were found to be almost devoid of organic precursors and the quantity of water vapor was found to be ten times lower than predicted.  In the upper atmosphere the temperature was several hundred degrees higher than expected, at around 700 C (1300 F), and wind speeds reached 520 kph (330 mph), 160 km (100 miles) below the cloud tops.  While the wind is potentially useful in remixing molecules and so allowing organic elementary chemistry to occur, it is so severe that it is likely to destroy the structure of any potential living entity that might be forming.   It had been thought that the atmospheric flow at this altitude would have been almost zero.   In addition, although thunderstorms were detected, the expected electrical activity in the clouds that could promote chemical processing was found to be almost non-existent.


So, conditions were found to be non-conducive for life at the upper levels.  Below this the temperature and pressure rises rapidly and no form of life as we know it would be able to survive at lower depths in the gas giant.

In common with other gas giants with no discernible solid surface, any life-bearing space debris swallowed up by the planet would be crushed and heated out of existence, as it plunged below the clouds.  Any life within the debris, whether in ice or rock, would be destroyed.

Galileo At Jupiter

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