No in fact study of exo-planets suggest that they are actually very common.
No.No.No.No.
Yes. They orbit the Sun and as per Kepler's first law they follow an elliptical path. Do note that a circular orbit is a special type of elliptical orbit.
Earth's orbit around the sun is fairly typical compared to other planets in our solar system. It follows an elliptical path, with the sun at one of the foci. The shape and orientation of Earth's orbit contribute to the changing seasons and variations in solar intensity.
You are thinking of Pluto. Pluto is now designated a minor planet.
Mercury and Pluto have the most elliptical orbits among the planets in our solar system. Mercury's orbit is the most eccentric, while Pluto's orbit is also highly elliptical due to its distance from the Sun and its eccentric orbit.
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.
elliptical
Yes, the distance from the sun is variable for anything with an elliptical orbit.
Compared to most of the other planets, Mercury's orbit is much more of an elliptical (oval) form. Mercury's distance to the Sun varies from 46 million to 70 million kilometers from the Sun. Given its proximity to the Sun, its orbital speed is also higher, at nearly 48 kilometers per second. (Earth orbits at 30 km/sec and Neptune at only 5.4 km/sec.)
All planets have elliptical orbits.
The orbit of Mercury has the highest eccentricity of all the Solar System planets
yes yes Yes, comets and asteroids usually follow elliptical orbit.