About planetary motions..?

Question

Are all the planets revolving in a single plane ,as in a single line or haphazard manner , detailed information expected.

Answer 1

The planets were formed from the planetary nebula that originally orbited around our Sun when it was still a proto-star. Planetary nebulae are a pancake shaped cloud of hydrogen, helium and the heavier elements.

As the nebula was essentially flat, it meant that most of the material that made up the planets was in a single plane. Little globs of the nebular began to form into little chunks of material and through collisions these became larger and larger. As they got larger, their gravity became more powerful and began to collect even more chunks. They continued to grow until they became the size they are now.  The gas giants followed the same path but in their case they attracted more gases than solid material.

So in essence, the planets are in a plane because the material that they are made of was in a plane. That's one of the reasons Pluto was downgraded to a minor planet because it is not always in the plane.

Answer 2

No...none of the planets are orbiting on the same plane.

Neither is is a haphazard manner.

All planets are orbiting in relation to the plane of the ecliptic (see link below) with earth defining that plane with the sun.  Every planets orbits pretty close to that plane but not exactly on it.  Pluto (which is no longer classified a planet) is pretty far off.

Answer 3

They are all moving close to the same plane. Earth's orbital place, called the plane of the ecliptic, is the one from which all other planet's orbital tilt is measured. Mercury has an orbit tilted 7 degrees to Earth's, and Pluto's orbit is tilted 17 degrees, which is one of the reasons it is no longer considered a planet. All the other planets are in orbits less than 5 degrees different from Earth.

Click on the name of each planet in the source to see more complete information on that planet, including Inclination of orbit.