Planets change orbit shape around Neptune’s size. Metal-rich stars help giant planets form. Eccentric orbits suggest chaotic planet formation.

However, most hypotheses agree on the type of orbit the planets should have ... have perfectly circular orbits. Plus, the planets' paths don't lie precisely on the same plane.

"This would explain why the outer planets of our solar system have two different types of moons." In contrast to the regular moons, which orbit close to the planet on circular orbits, the ...

This means that objects in small orbits travel faster than objects in large orbits. The graph shows how the orbital speed of a planet changes with its distance from the Sun. Polar orbits take the ...

This means that objects in small orbits travel faster than objects in large orbits. The graph shows how the orbital speed of a planet changes with its distance from the Sun. Geostationary close ...