Comets. They spend a lot of their time moving slowly at far distances from the sun, with brief periods of time spent closer to the sun, moving at higher speeds.
Yes, some do.
because its orbit was highly eccentric and used to intercede the orbit of Neptune. that is why Pluto is no more a part of our solar system as it collided with Neptune and exploded.
comet
Comets are small bodies of rock and ice which are in a highly eccentric orbit directly around our sun.
Comets go around the Sun in a highly elliptical orbit.
pluto
pluto
in some parts of its orbit it is much closer to the Sun than in other parts.
It deviates from a perfect circle by a considerable amount.
All the planets in the solar system have very low eccentric orbits.
The least eccentric orbit is Venus The most eccentric orbit is Pluto (aside from Pluto, Mercury)
Within our own solar system, an object known as 90377 Sedna, has the longest orbital period, which is equivalent to 11,400 years. It has a highly eccentric orbit, with a distance of 76AU from the sun at it's perihelion and 960AU at it's aphelion.