* Kepler's Laws of Planetary Motion: These laws explain how planets move around the Sun. One of the key laws states that the square of a planet's orbital period (the time it takes to complete one orbit) is proportional to the cube of its average distance from the Sun.
* Gravity and Distance: The Sun's gravity pulls on planets, causing them to orbit. The farther away a planet is, the weaker the gravitational pull. This means a planet further out has to travel slower to stay in orbit.
So, the planets that take the longest to orbit the Sun are the ones farthest away:
1. Neptune: Neptune is the farthest planet from the Sun and takes about 165 Earth years to complete one orbit.
2. Uranus: Uranus takes about 84 Earth years to orbit the Sun.
3. Saturn: It takes Saturn about 29.5 Earth years to complete one orbit.
4. Jupiter: Jupiter, the largest planet in our solar system, takes about 12 Earth years to orbit the Sun.
