Comets.
Periodic comets have highly eccentric elliptical orbits, with eccentricities.
Of all the significant bodies in the solar system, comets are the ones with -- the most eccentric elliptical orbits -- the orbits most inclined to the plane of the ecliptic -- the most volatile compositions
Yes, none of the planets in our solar system have exactly circular orbits, though some are more eccentric than others.
Venus has the least eccentric (most nearly circular) orbit of the eight in our solar system.
in fixed orbits
Mercury has an elliptical orbit, it is also one of the most eccentric orbits of our solar system.
The planet with the most eccentric orbit in our solar system is Mercury. Its orbit is elongated, varying the distance from the Sun significantly. This eccentricity causes it to experience extreme temperature differences between its closest and farthest points from the Sun.
Kepler discovered the orbits of the solar system are elliptical.
Mercury's orbit is moderately eccentric, at 0.2056, while Venus's orbit is the least eccentric of any planet in the solar system, at 0.0067. Mercury's inclination is at 7º, while Venus's is at 3.39º.
Yes, everything that orbits our sun, including everything that orbits everything that orbits our sun, is part of the solar system.
No. Pluto orbits in our solar system.
A moon orbits a planet.
The heart is the star around which the solar system orbits. In our solar system the heart would be our sun