Why do all the planets travel around the sun in the same direction

They go around in a circle because there is something that makes it go around

Ah yes!

Also all of the asteroids.

And it's also the same direction in which most

of the moons revolve around their planets.

And it's also the same direction in which

the sun and most of the planets rotate.

Fascinating, eh Captain?

Once you have noticed that fascinating pattern everywhere

throughout the solar system, it becomes a lot easier to understand

the concept of one gigantic, rotating cloud of dust and gas which,

over billions of years, shrinks and condenses to form the sun, plus

tiny bits and pieces of leftover material in orbit around the sun.