Jupiter is so massive that its shared centre of gravity with the Sun lies just outside the Sun’s surface — making it the only planet whose individual barycentre with the Sun falls beyond the Sun itself, and the largest contributor to the star’s planetary wobble.

The Sun-Jupiter balance point lies about 742,000 kilometres from the Sun's centre at Jupiter's mean distance, but the full Solar System makes the Sun's real path more complex. The post Jupiter is so massive that its shared centre of gravity with the Sun lies just outside the Sun’s surface — making it the only planet whose individual barycentre with the Sun falls beyond the Sun itself, and the…