solar systems
The possessive form of the noun "planets" is "planets'."
It is highly unlikely for planets to form on another planet. Planets typically form from material surrounding a star, not from existing planets. However, moons can form around planets through processes such as accretion or capture.
planets
no
None Stars are gas Planets are solid
No. Planets form by a process called accretion, which is driven by gravity. Nobody creates planets.
No
A solar system!
MVEMJSUN
Parts of other planets
Easy God is the answer to that
They don't - new born stars and planets are formed together.