Answer:
What has ten letters and starts with gas?
I know a word of letters three, add two and less there will be.
Never ahead, ever behind, yet flying swiftly past; For a child I last forever, for adults I'm gone too fast.
A canvas full of stars.
Sometimes it's silver but also gold. Printed on paper it's a treasure to hold. What is it?
It is something you will never see again.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?