No, all planets in the solar system do not have the same length of year.

Here's why:

* A year is defined as the time it takes a planet to complete one orbit around the sun.

* The further a planet is from the sun, the longer its orbital path.

* The longer the orbital path, the longer it takes to complete one orbit.

Therefore, planets like Mercury, which is closest to the sun, have much shorter years than planets like Neptune, which is furthest away.

Here's a table showing the approximate length of a year on each planet in our solar system:

| Planet | Length of Year (Earth Days) |

|---|---|

| Mercury | 88 |

| Venus | 225 |

| Earth | 365.25 |

| Mars | 687 |

| Jupiter | 4,333 |

| Saturn | 10,759 |

| Uranus | 30,687 |

| Neptune | 60,190 |