Why do we have planets?

Question: Why do we have planets?
- Keywords:
  planet
Asked by 492gdge39 to Chris on 16 Mar 2016.
- Chris Conselice answered on 16 Mar 2016:
  
  They are likely the result of left over material from when it’s star forms. Stars form out of gas and when there’s a bit left over it forms the planets.

Ayayai commented on 16 Mar 2016:

Does that mean all planets are made of gas?

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Ami_awesome commented on 16 Mar 2016:

@Chris where does the gas from the stars come from ?

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Question: Why do we have planets?