Oval or elliptical shaped.
(Not a perfect circle)
The SHAPE of the orbit the Earth and most planets and other bodies of mass in space are usually elliptical.
All the planets in the solar system are kept in orbit by the gravitational pull of the sun. The effect of the other planets and other bodies in the solar system is to change the shape of the orbits slightly but the sun is what keeps them in orbit around the sun.
The actual shape of the earth's orbit around the sun is horrendously complicated. Partly because the earth does not orbit the sun and also because the orbit is influenced by the the gravitational attraction of the other planets. The earth does not orbit the sun: the centre of mass of the earth-sun system is at one of the foci of an ellipse whose eccentricity is 0.0167. The eccentricity varies from 0.0034 to 0.058.
Mars, and all the other planets, have oval-shaped, or eliptical, orbits.
Elliptical Orbit
in term of shape
sphere
The type of object that orbits the sun and has cleared the area of its orbit is called a planet. Planets are celestial bodies that orbit the sun, are spherical in shape, and have cleared their orbit of other debris or objects. There are currently eight known planets in our solar system.
Like the other planets, Uranus has an elliptical orbit as it moves around the sun rather than a circular orbit. Uranus has an axial tilt of 99 degrees, which is a lot, considering the axial tilt of the Earth is 23.5 degrees.
An ellipse.
Ellipse.
Planets orbit in an ellipse.