The semi-major axis.
AUs
Starting at the Sun, and working outwards by average orbital distance, the planets of the Solar System are.... # Mercury # Venus # Earth # Mars # Jupiter # Saturn # Uranus # Neptune
Jupiter's orbit is an ellipse with an eccentricity of 0.048, which means that it looks like a circle with the Sun off-centre by an amount equal to 0.048 times the average radius. Uranus has an eccentricity of 0.047 and that is the closest among the other planets.
The average orbital path of the planets forms the elliptic plane. The two inner planets have the greatest deviation from the path, with Mercury at 7.01 degrees and Venus at 3.39 degrees.
Ellipse
AUs
Considering the nine known planets including Pluto, Mars is the one with the fourth smallest average orbital distance from the sun.
Starting at the Sun, and working outwards by average orbital distance, the planets of the Solar System are.... # Mercury # Venus # Earth # Mars # Jupiter # Saturn # Uranus # Neptune
At what distance from the Sun would a planet's orbital period be 3 million years?
No because the distance between them are always changing. If you were trying to ask if the orbital paths of all the planets about the same distance apart then the answer is still no. The distance from each orbital path varies from each planet to the next. The orbital path of Neptune and Pluto cross one another so this also answers the question, no.
Jupiter's orbit is an ellipse with an eccentricity of 0.048, which means that it looks like a circle with the Sun off-centre by an amount equal to 0.048 times the average radius. Uranus has an eccentricity of 0.047 and that is the closest among the other planets.
Of the eight (or nine) planets so far known to orbit the sun, Saturn is the one whose average orbital distance from the sun is the sixth smallest.
Johannes Kepler stated that the planets revolve around the sun in an ellipse.
Because according to Kepler's laws the orbital speed of a planet is proportional to the square root of the reciprocal of the distance: v = d-½.
The average orbital path of the planets forms the elliptic plane. The two inner planets have the greatest deviation from the path, with Mercury at 7.01 degrees and Venus at 3.39 degrees.
All massive objects in the solar system feel the gravitational influence of their primary and most follow an orbital path around it - the majority of the mass orbiting the Sun, including planets, asteroids, comets, etc. A common orbital path, such as the planets follow, is shaped like an ellipse with the Sun at the ellipse's focus. Moons which orbit planets follow a smaller orbital path around their primary (for example, the Earth's Moon follows a path around Earth which it completes in about a month). If objects felt mutual gravitational pull of another object but did not have sufficient relative orbital momentum, they would collide.
Ellipse