The Solar System at full scale is the Sun, its eight planets and the Kuiper belt, out to the heliopause where the solar wind gives way to interstellar space.
About The Solar System
The Sun holds nearly all the mass of the system; the planets, moons and minor bodies together are a small remainder. Beyond the rocky inner worlds orbit the giants: Jupiter and Saturn, made mostly of hydrogen and helium, and Uranus and Neptune, rich in ices. Past Neptune lies the Kuiper belt, a broad ring of icy bodies that includes Pluto.
The Sun blows a constant wind of charged particles that carves a bubble in the interstellar gas, the heliosphere. Its boundary, the heliopause, has been crossed by both Voyager spacecraft, the only machines to have reached interstellar space.
What you see in the piece
At this scale the planets are far smaller than a pixel and appear only as faint points of reflected sunlight; switch on orbits (O) to see the paths that place them. The Voyagers are shown at their current positions.
Questions
How big is the Solar System?
It depends where you draw the edge. The planets end at Neptune, the solar wind ends at the heliopause, and the Sun’s gravity still holds the far larger Oort cloud.
Where does the Solar System end?
The heliopause is where the Sun’s wind meets interstellar gas, but the Oort cloud of comets lies far beyond it, still bound to the Sun.