All the major planets orbit the Sun in the same direction because they were born from a single, rotating disk of gas and dust, and the conservation of angular momentum kept that original spin direction locked in.

From cloud to flat disk

  • The Solar System started as a large, cold cloud of gas and dust (a solar nebula) that began to collapse under its own gravity. Any tiny initial spin that cloud had became faster as it shrank, just like a spinning figure skater pulling in their arms.
  • As it spun faster, the cloud flattened into a disk around the forming Sun because material could fall inward more easily along the poles than along the equator, where rotation partially “fights” gravity.

Why one common direction?

  • Everything in that disk orbited the young Sun in the same overall direction as the disk’s spin, so the bits of rock and ice that later merged into planets were already moving the same way.
  • Collisions and interactions over millions of years tended to erase or eject material on weird or crossing paths, leaving behind bodies sharing roughly the same direction and similar orbital planes.

What about the orbital plane?

  • Because the material was confined to a rotating disk, planets naturally formed in or near a single plane (the ecliptic), instead of at random angles above and below the Sun.
  • Small deviations exist (each planet’s orbit is slightly tilted), but big “over the top” or perpendicular orbits are rare because they would have led to more violent collisions during formation.

Exceptions and oddballs

  • Venus and Uranus have unusual spins (tilted or retrograde rotation), probably due to past giant impacts or gravitational upheavals, but they still orbit the Sun in the standard direction.
  • Some comets and a few asteroids do orbit backward (retrograde), showing that small bodies can be kicked into odd paths more easily than massive planets can.

Quick “forum-style” takeaway

The planets don’t “choose” a direction; they inherited it. A spinning cloud collapsed, turned into a flat disk, and everything that survived forming into planets ended up circling the Sun the same way that disk was already spinning.

TL;DR:
They all orbit in the same direction because they formed in a single spinning disk around the young Sun, and conservation of angular momentum kept that shared direction and plane of motion mostly intact.

Information gathered from public forums or data available on the internet and portrayed here.