Isaac newton showed that an elliptical orbit like the one described in Kepler's laws is produced when the gravitational force is an inverse-square law, in other words if the distance doubles, the force goes to a quarter. He did this by producing the law of gravity, the laws of motion, and the differential calculus, and these are covered in school-level mathematics.
To be in a perfect orbit around the Sun, maintaining always the same distance, at a specific distance a planet would need a very specific speed. Since it is unlikely that it just happens to have the correct speed, it will move around the Sun in an ellipse instead.
Johannes Kepler was the first to state that planets move in elliptical orbits.
That is one of Kepler's Laws, stated by Johannes Kepler.
You are thinking of Pluto. Pluto is now designated a minor planet.
gravity... i think
The shape of a comet's orbit is called an ellipse. This shape is a sort of narrowed circle and comets move in this shape around the sun.
Kepler
It is Kepler's first law which says the planet moves in an ellipse with the Sun occupying one focus and the other focus is vacant.
Planets remain almost perfectly spherical as they move around the sun. The paths they follow are ellipses, with the sun at one focus of each ellipse.
Planetary orbits are usually in the shape of an ellipse.
To be in a perfect orbit around the Sun, maintaining always the same distance, at a specific distance a planet would need a very specific speed. Since it is unlikely that it just happens to have the correct speed, it will move around the Sun in an ellipse instead.
Johannes Kepler was the first to state that planets move in elliptical orbits.
no you can not move around on Jupiter because it is a gas planet.
The person who first stated this was Johannes Kepler.
it's gravity
neptune
Its Orbit.Johannes Kepler (Germany), who lived between the time of Copernicus (Poland) and Isaac Newton (England), correctly postulated that all of the sun's planets indeed revolve about the sun in orbits which have the shape of an ellipse, with the sun at one focus of the ellipse. Isaac Newton, in his Principiae Mathematica, further stated, essentially, that any planet orbiting any star, or any moon orbiting any planet, would follow an elliptical path.