Based on their respective distances from the sun, Jupiter is the planet that can approach Saturn most closely. Even so, the two planets are still over 400 million miles apart at the closest point in their orbits.
Astronomers mark the orbit of Jupiter as the beginning of the outer solar system. Jupiter takes 12 years to orbit the sun at an average distance of nearly 500 million miles. In contrast, Saturn is located almost twice as far from the sun as Jupiter and takes nearly 30 years to complete one orbit. Jupiter, Saturn, Uranus and Neptune are gas giants many times larger than Earth and the other planets of the inner solar system.