Why do the planets in the solar system orbit on the same plane?

[admin]

About 4.5 billion years ago, the solar system was just a giant, spinning cloud of gas and dust. Today, it's flat. Here's how that happened.

Why do the planets in the solar system orbit on the same plane? : Read more

 

[Broadlands]

The Earth is about 4.5 billion years old. Liquid water and rocks were present by at least 3.8 Byr-ago. along with rare-earth elements. At what point does the flat "dust" in the solar system become planet building materials...silicates and other rock-forming minerals, not just gases.