Why do all planets in our solar system orbit within roughly the same plane?

Answer 1

Most likely because they all formed by the same orbiting disk of debris.

Answer 2

When the solar system formed from a nebular gas/dust cloud. Effects of rotational angular momentum conservation and gravitation set the dust to form the solar plane. Thus, when the planets formed, they formed all in the same plane and with the same revolutional orientation.

Answer 3

Actually they don't... Pluto, which was recently determined to be a "Dwarf Planet" is on a radically different plane than the rest of the solar system.

4.5 billion years ago, when there was nothing here but a huge nebulous cloud, The sun, moons and the planets coalesced from the dust clouds....

Answer 4

The forces that initiated the beginning of our solar system began like a smoke ring
A wedge shaped piece of rocky matter that crashed into the edge of the hydrogen field that the original massive star had formed from.
It formed a roiling disc that eventually coalesced into our solar system.

Answer 5

before everything, in a image voltaic gadget the planetary orbits re extremely some as for inclination and eccentricity. in spite of the undeniable fact that, in our image voltaic gadget they lie approximately on the comparable airplane, yet they are not parallel to the galactic airplane. Our ecliptic has an obliquity of roughly 60° admire to the galactic airplane. the combination of this ecliptic obliquity and the inclination of Earth's axis explains why in a summer season night (as quickly as we are finding in direction of the galactic centre) the form of Milky way seems to be vertical interior the sky from our observational element. If we've been parallel to the galactic airplane, it would seem close by parallel to the horizon.

Answer 6

Theory is that the planets were flung out from the sun. That would mean being on a plane with the sun's equator.

Answer 7

The suns gravity is making them all orbit around its equator.