* Earth's orbit defines a year: One Earth year is the time it takes for our planet to complete one full orbit around the sun.

* Other planets have different orbital periods: Each planet in our solar system takes a different amount of time to orbit the sun.

Therefore, no other planet completes a full orbit around the sun in one Earth year.

Here's a quick comparison:

* Mercury: Orbits the sun about 4 times in one Earth year.

* Venus: Orbits the sun about 2 times in one Earth year.

* Mars: Takes about 2 Earth years to orbit the sun.

* Jupiter: Takes about 12 Earth years to orbit the sun.

* Saturn: Takes about 29 Earth years to orbit the sun.

* Uranus: Takes about 84 Earth years to orbit the sun.

* Neptune: Takes about 165 Earth years to orbit the sun.