Meaning: The planets will continue to move around the sun in a constantly changing and beautiful way forever.
Choice of Words: Never ends means it will continue forever. Always new means it is constantly changing and never the same.
Alternative Expressions
Their dance is never-ending, ever-changing.
Meaning: This means that the dancers will keep dancing forever and their dances will always be different.
Choice of Words:Their refers to the dancers, dance is the activity they are doing, never-ending means it will continue forever, ever-changing means it will be different each time.
The dancers keep dancing, their moves forever new.
Meaning: This means that the dancers will keep dancing forever and their dances will always be different.
Choice of Words:The refers to the dancers, dancers are the people doing the activity, keep means they continue doing something, dancing is the activity they are doing, their refers to the dancers, moves are the way they dance, forever means it will continue forever, and new means it will be different each time.