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Pluto and Eris have the most elliptical and tilted orbits among the known dwarf planets. Pluto's orbit is highly elliptical and tilted compared to the eight planets in our solar system. Eris also has a very elliptical orbit and is tilted at a steep angle.
As an elliptical orbit is any orbit that isn't perfectly circular, everything has an elliptical orbit. The planets Mercury and Pluto have the most elliptical orbits of the planets, and are easily seen to be oval shaped. Comets also have highly elliptical orbits.
Pluto has an oblique and elliptical orbit compared to the other planets in our solar system. Its orbit is tilted relative to the plane of the solar system, and it is more elongated than the orbits of the major planets.
No, not all planets have elliptical orbits. While most planets in our solar system have nearly circular orbits, some planets, like Mercury and Pluto, have more elliptical orbits. Additionally, exoplanets outside our solar system can have a variety of orbital shapes.
Most planets have elliptical orbits around the Sun. These orbits are slightly elongated circles, with the planet closer to the Sun at one end (perihelion) and farther away at the other end (aphelion).
Johannes Kepler introduced the concept of elliptical orbits in the early 17th century. His laws of planetary motion replaced the previously held idea of perfect circular orbits. This advance in understanding planetary motion led to the development of modern celestial mechanics.