Answer:
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
What is long and slim, works in light. Has but one eye, and an awful bite?
A time when they're green. A time when they're brown. But both of these times, cause me to frown. But just in between, for a very short while. They're perfect and yellow. And cause me to smile.
I climb higher when hot, But beware my rage, Iβll kill with a breath, If I can escape my cage
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?