Interior
The known composition and mass of Jupiter and its gravity field indicate that Jupiter has a solid core. The presence of such a core differentiates between the various Jupiter formation theories. Formation under direct gravitational collapse of gaseous material, much like the formation of the Sun and accretion onto a planetesimal results in different histories and different explanations for how the interior of Jupiter rotates. Thus, measuring the gravity field can inform us about the internal structure. The gravity field is in turn determined by precise measurements from the Juno spacecraft's motion, in its orbit under Jupiter's gravity. New knowledge of the gravity field reveals the distribution of mass in the core and the deep structure of Jupiter.
