Answer:
I make a loud sound when I'm changing. When I do change I get bigger but weigh less. What am I?
I move without wings Between silken string I leave as you find My substance behind.
By Moon or by Sun I shall be found. Yet I am undone if there's no light around.
Flat as a leaf round as a ring. I have two eyes but can't see a thing.
I am always running but I never get tired or hot. What am I?
The answer I give is yes, but what I mean is no. What was the question?