The wording of this question needs to be improved to understand what you mean.
All planets in our solar system have elliptical orbits.
All the planets have elliptical orbits but Uranus and Neptune have slightly different orbits than other planets on solar system.
All the planets in the solar system have very low eccentric orbits.
There are 8 planets orbiting the Sun in our solar system.
The planets in the solar system are in well-spaced out, stable, roughly circular orbits - they don't come close enough to collide with each other. Asteroids and comets, however, are on more elliptical, unstable orbits that often cross the orbits of the planets, and sometimes planets collide with asteroids and comets.
Ellipses
One of the discoveries that led to the modern view of the Solar System was that the "orbits" of the planets were ellipses.
The orbits of the planets all lie in nearly the same plane for preservation of angular momentum.
Gravity from the Sun holds the planets in their orbits.
The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them.
None of the planets pass out of our solar system. The orbits of the planets, irregular as they may be IS the solar system.
That was the work of Kepler, resulting in his Laws of Planetary Motion.
Gravity holds the planets in their orbit
All planets in our solar system have elliptical orbits.
It doesn't. All of the planets in our solar system orbits the sun.
Yes, none of the planets in our solar system have exactly circular orbits, though some are more eccentric than others.
All the planets have elliptical orbits but Uranus and Neptune have slightly different orbits than other planets on solar system.