Hum,

>>"Jupiter will still be recognisable at first glance"

i suppose once you`ve seen one gas giant, (and fuel scooped them) you`ve seen them all...(Well, that`s how it seemed in frontier elite).

[Hum, a 70 year climatic cycle... using M = a^{3} / P^{2}

where:

**M **is the mass of the primary body, in units of the solar mass.

**a** is the length of the semi-major axis of the elliptical orbit in units of the mean Earth-Sun distance, 1 A.U. (astronomical unit). (BTW If the orbit is circular the semi-major axis = radius of the orbit.)

**P** is the period if the orbit in Earth years.

i work the length of the year to be : 11.86 Earth years

(the solar cycle happens to be about 11 years as well)

But there doesn`t seem to be a straightforward `solar` influence there...(ie 6 x 12 =72?)

Perhaps we are seeing the fluid dynamics of Jupiter's atmospheres and some sort of `chaos theory`...that has a `resonance` or `attractor` around 70 earth years...