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Jupiter's role in the structure of our solar system is immensely consequential, especially when discussing the asteroid belt.

The colossal mass of Jupiter exerts a gravitational influence strong enough to shape the destiny of numerous space bodies near its orbit. Notably, this includes the vast assemblage of rocks and debris we know as the asteroid belt. The asteroids swinging around the sun between Mars and Jupiter never had the chance to merge into a larger planetary body primarily because of Jupiter's ceaseless tug.

This shepherding effect caused by Jupiter's gravity means that the rocks are essentially locked in a cosmic dance – a gravitational ballet that forbids them to come together. To illustrate the magnitude, Jupiter's gravitational impact is such that it even distorts the orbits of nearby asteroids, leading some to follow highly elongated paths. Consequently, Jupiter's presence is crucial to nurturing the asteroid belt in its current fragmented state.

To comprehend the solar system structure, one must visualize a system of planets and various celestial objects revolving around a central star, our sun. Each component, from the smallest asteroid to the largest planet, follows specific paths known as orbits shaped by complex gravitational interactions.

The solar system's structure has an intricate order, with inner rocky planets like Mars and Earth located closer to the sun, followed by the outer gas giants like Jupiter and Saturn. Between these two realms lies the asteroid belt, a by-product of the solar system’s formative years acting as a boundary of sorts. It's important to recognize that this organization is not accidental. It's the result of numerous celestial dynamics playing out over billions of years, including the forceful influence of Jupiter's gravity at various stages of development.

Inquiring into the formation of planetary bodies takes us back to the infancy of our solar system. During this period, a gigantic cloud of gas and dust, known as the solar nebula, began to collapse under its gravity. This collapse initiated a spinning motion, eventually leading to the formation of the sun at its center, with the remaining material forming a protoplanetary disk around it.

Over time, particles within the disk collided and stuck together, gradually building up into larger and larger bodies – a process termed accretion. This led to the formation of planetesimals and, ultimately, the planets we are familiar with today. However, regions like the asteroid belt present a different scenario. Here, the encounter with Jupiter's forceful gravitational field halted the accretion process, preventing the fragments from ever melding into a fully-fledged planet.