No, Pluto is not the only body in the solar system with an elliptical orbit. All planets and dwarf planets in the solar system have elliptical orbits.

While Pluto's orbit is particularly eccentric (meaning it deviates significantly from a perfect circle), all orbits are ellipses to some degree. Even Earth's orbit, while close to circular, is technically an ellipse.

Here's why:

* Kepler's Laws of Planetary Motion: These laws, established by Johannes Kepler, describe the motion of planets around the Sun. The first law states that planets move in elliptical orbits with the Sun at one focus.

* Gravitational Attraction: The gravitational force between the Sun and a planet is not constant throughout the orbit. It's stronger when the planet is closer to the Sun and weaker when it's further away. This variation in force leads to the elliptical path.

So, while Pluto has a more exaggerated elliptical orbit than many other planets, all celestial bodies in the solar system orbit the Sun in elliptical paths.