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Yes, when Cassini entered orbit around Saturn it did cause the planet's orbit to change.
Venus
The outermost planet in our solar system, Neptune, is often referred to as the eighth planet. When Pluto was considered a planet (prior to 2006) during its orbit it would cross inside the orbit of Neptune making the latter the outermost planet.
no because stars can orbit each other
The planet will orbit the sun, while moons orbit the planet.
Yes, when Cassini entered orbit around Saturn it did cause the planet's orbit to change.
Venus
The tilt in the axis of the planet's (Earth's) spin and the yearly orbit of the planet round the sun.
Comets don't orbit a planet, they orbit the sun.
No, Venus does not orbit a planet. It orbits a star, which is our Sun. It can not orbit a planet , if it did it would be a moon
The outermost planet in our solar system, Neptune, is often referred to as the eighth planet. When Pluto was considered a planet (prior to 2006) during its orbit it would cross inside the orbit of Neptune making the latter the outermost planet.
Planets orbit stars, not other planets. A planet-like object that orbits a planet is a moon.
The plane with the smallest orbit is Mercury, and the planet with the largest orbit is Neptune.
Using strict modern definitions - none. The orbit of Pluto does cross inside the orbit of Neptune during part of it's journey around the sun, but Pluto is no longer officially a planet - it is a "dwarf planet" or "planetoid".
Neptune.
The shape of a planet's orbit is elliptical.
The orbit of a planet is commonly an ellipse.