Answer:
It is a path of cow juice spread across the sky but cannot be seen by the naked eye
Take one out and scratch my head I am now black but once was red.
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
What has two legs but doesn't walk?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?