Jeans escape: Process leading to the escape of atomic or molecular species from a planet atmosphere. It happens when the thermal agitation rate is greater than the escape rate. The lighter elements or molecules (like H, H2 or He) escape faster than the heavier ones.

Jovian planets: Other name for giant planets.

Jupiter: The fifth and largest planet (1400times the Earth volume, 320times the Earth mass) of the Solar System. Jupiter is 5.2AU away from the Sun. Its gaseous envelope mainly made of H2 and He, surrounds a core of ice and rocks (10-20 Earth mass).

Juvenile gases: Gases produced by or trapped inside the Earth and that reach the surface of Earth for the first time. 3He is an example of juvenile gas detected in submarine geothermal fluids.

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