The closer a planet is to the sun, the shorter its year. The farther it is from the sun, the longer its year. This means that Mercury’s year is equal to 0.24 of the Earth’s years. This means that Mars’ year is equal to 1.88 Earth years. The reason for this is because the closer a planet is to the sun, the faster it travels in its own orbit.
A year is equal to the amount of time it takes for any given planet to complete an orbit around the sun. The further away a planet it, the longer its orbit will be and the longer it will take for the planet to complete an orbit. Therefore, planets closer to the sun have shorter years than planets further from the sun (Mercury has the shortest year, and Neptune has the longest year).
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