Question

How many earth years does it take Pluto to orbit the sun?

Answer 1

Hint: The International Astronomical Union (IAU) has considered Pluto as a dwarf planet because it failed to fulfill the three standards the IAU uses to define a full-sized planet. It was the first and the largest planet to be discovered in the Kuiper belt.

Complete answer: Pluto takes 248 Earth years to complete one orbit around the Sun. Its orbital path is tended at an angle of 17° and its orbit is more elliptical as compared to other planets. Like the planet Uranus, it also rotates on its side, its axis inclined nearly 120 degrees.
As Pluto moves closer to the Sun, the ice on its surface warms up slightly and sublimes to form a thin atmosphere of nitrogen. As it shifts away from the Sun, the gases cool down and refreeze. The atmosphere may disappear as Pluto moves away from the Sun.
As Pluto is close to Neptune, it crosses Neptune's orbit and gets nearer to the Sun. This orbital structure takes place once in every 500 years. After this, the two objects return to their original positions and the cycle repeats. Their mean-motion resonance is 2:3 which means that for every two orbits Pluto around the Sun, Neptune makes three.

Note: The Hubble Space Telescope of NASA has indicated that Pluto's crust could comprise complex organic molecules. Tombaugh Region is a unique feature of Pluto's surface, which is a heart-shaped region.