do all planets have the length of their year?

Answer 1

Yes all planets have different length years from one another. And all moons have different length months from one another (except for Tethys and its L4 and L5 co-orbital moons, and ditto Dione and its L4 and L5 co-orbital moons, which all whirl around Saturn),

And the Trojan groups of asteroids that co-orbit rhe Sun with Jupiter at its L4 and L5 points similarly have the same year and semi-major axis as Jupiter does. (though the Trojans are not planets of course).

It has nothing to do with their mass or their speed of rotation on their axes. it has everything to do with their distance from the object around which they rotate. Or to be more precise the barycentre of the two-body system.

There is a simple mathematical law that relates the planet's year to its semi-major axis and it is known as Kepler's 3rd Law of Planetary Motion.

"The squares of the orbital periods of planets are directly proportional to the cubes of the semi-major axis of the orbits".

Example:
Earth 1 AU and 1 year.
Mars 1.5236 AUs and 1.8808 years

(1.5236)^3 = 3.5368
(1.8808)^2 = 3.5374

It applies to minor planets and dwarf planets too:

Mercury 0.2408 years and and 0.3871 AU
Venus 0.615917 years and 0.723332 AU
Ceres 4.599 years and 2.76 AU
Jupiter 11.862 years and 5.2033 AU
Saturn 29.46 years and 9.5371 AU
Uranus 84.07 years and 19.191 AU
Neptune 164.88 years and 30.069 AU
Pluto 248.09 years.and 39.4817 AU
Eris 557 years and 67.668 AU
Sedna 12050.32 years and 525.606 AU

Check out the arithmetic for yourself. (Any small discrepancies will have been introduced by the rounding up and down of the distances and times involved,)

I would presume that a similar law to Kepler's Third Law governs the 212 extra-solar planets and, more specifically, the 20 stars with more than 1 planet so far discovered. Elliptical orbits seem pretty universal throughout the Universe.

Answer 2

You question appears a bit vague.

Any planet that orbits a star has a year. By definition a year is the amount of time it takes for the planet to make one full trip around the star. That means any planet that orbits a star has a year. Each planets year is different because they take different amounts of time to orbit the star they around. So a year on mercury is much shorter than a year on pluto.

When measuring the "year" of planets, they are often measured using the number of days on earth it takes for the planet to have 1 ful. orbit of the star. That is why a year on mercury is 88 days, while a year on earth is 365 days.

now all of the planets in our solar system have a year. The year is different for each planet. The measurement is based on earth days. Meaning that Jupiter for example, will take 11.86 year years to make one orbit of the sun, or one jupiter year. Saturn wil take 29.46 earth years to make one orbit of the sun

below is a list of how long it takes for each planet in our solar system to complete one full orbit.
Mercury 88 days
venus 224.7 days
earth 365 1/4 days
mars 687 days
jupiter 11.86 years
saturn 29.46 years
uranus 84.07 years
neptune 164.88 years
pluto 248.09 years.

Answer 3

A year is the length of time it takes a planet to make one full revolution around the sun. On earth this takes 365.25 earth days.

The time it takes the planets in this solar system to revolve around this sun is well known. For example, it takes Jupiter one Jupiter year to revolve around the sun. For convenience these figures are often converted to earth years as follows:

Mercury 0.24, Venus 0.62, Earth 1, Mars 1.88, Jupiter 11.86, Saturn 29.46, Uranus 84.01, Neptune 164.8, Pluto 247.7
(I know Pluto is not classified as a planet anymore - but the data is there anyway!)

Answer 4

yes, however our year is 356 days long, the def. of a year means a planets revolution around the sun. Mars, Jupiter, etc. they all have different length(days) around the sun. Mars is like 600 some days or something like that.

Answer 5

The length of the year of a planet increase with distance from Sun.The first:Mercury 88days,Venus225,Earth365.24219878,Mars687[1.88years]Jupiter11.9Y,Saturn29.5,Uranus84YNeptun165Y,[Pluto248Y,now considered not a planet].

Answer 6

Yes, each planet turns, but how large a planet is and how fast it turns will determine how long that planet's year is.

Answer 7

i belive , yes all planets have the length of their year

Answer 8

Well the humans have characterised the change in seasons by calling it as a year.
So actually all the planets have different seasons and so does their years.