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Q: What is the length of semi major axis of a planet in au with a period of 10.8 years?
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Which planet has a year which is twice the length of an earth year?

Mars with an orbital period of 1.88 years.


What major planet in the solar system has the longest orbital period?

Neptune, at about 165 Earth years.


Why is Jupiter years longer than earth?

This can be answered looking at Kepler's Third Law: "The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit." What this means is that as the distance of a planet to the sun increases, this change is directly proportional to the length of it's year.


What is the length of year for planet Mars?

Mars period of revolution around the sun, its orbit, is 686.971 Earth days long, or 1.88 Earth years.


Which planet has a period of revolution of about 30 years?

Saturn.


What is the period of revolution for the planet Jupiter?

12 years.


What is the length of period of revolution on Jupiter in years?

About 12 of our years.


What is one rotation period for a planet called?

chocolate pie... but that was 3 years ago...


How long are the days and years of the planet Ceres?

Ceres has a rotation period of 0.3781 days, and an orbital period of 4.6 years.


How do Kepler's 3 laws of motion combined with the parts of an ellipse explain the amount of time it takes for a planet to orbit the sun based on its length?

One of the parts of an ellipse is the length of its major axis. Half that is called the semimajor axis. Kepler's 3rd law says that the time to do one orbit is proportional to the 3/2 power of the semimajor axis. IF the semimajor axis is one astronomical unit the period is one year (the Earth). For a planet with a semimajor axis of 4 AUs the period would have to be 8 years, by Kepler-3.


How do Keplers 3 laws of motion combined with the parts of an ellipse explain the amount of time it takes for a planet to orbit the sun based on its length?

One of the parts of an ellipse is the length of its major axis. Half that is called the semimajor axis. Kepler's 3rd law says that the time to do one orbit is proportional to the 3/2 power of the semimajor axis. IF the semimajor axis is one astronomical unit the period is one year (the Earth). For a planet with a semimajor axis of 4 AUs the period would have to be 8 years, by Kepler-3.


How many days are a year on the dwarf planets?

There is no constant year length for planets, dwarf type or otherwise. A planet's period (year length) depends entirely upon how long it take to orbit its star. Depending on the planet and its situation, that might take a matter of a few days, or a few years, or even centuries.