10000 klm
they differ because of their distances around the sun
You could find out their distances from the Sun. Then for each 100 million km you could call it 100 millimeters instead.
A year on each planet is determined by its orbital period around the sun. For example, a year on Earth is around 365 days, while a year on Mars is about 687 Earth days. The length of a year on a planet is influenced by its distance from the sun and its orbital speed.
Because each planet is a different distance away from the sun. The farther away from the sun, the longer and wider it's orbital path is, therefore the longer it will take to complete one complete orbit around the sun.
The distances vary as the planets orbit the Sun. On average, the answer is Mercury.
It's better to ask how far are the planets from the sun since they all move around it at a realively constant distance, but their distances to each other are constantly changing and can vary widely.
In general, since the sun is the source of their heat energy, the further away a planet is from the sun, the cooler it is.
Inertia is trying to keep each planet moving in a straight line, and the sun's gravity is trying to pull each planet into the sun. The resultant of those two vectors is the orbital path each planet follows.
Mars is not far from there. The average of its perihelionand aphelion distances is 227,939,200 Km. (rounded)
The Sun is many thousands of times closer to Earth than any other star.
Kepler's Laws of Planetary Motion:1] Each planet moves in an elliptical orbit with the sun at one focus2] The line form the sun to any planet sweeps out equal areas of space in equal time intervals3] The squares of the times of revolution (days, months or years) of the planets are proportional to the cubes of their average distances from the sun.
It relates because if the planet is closer resieves more light from the sun.