Answer:
I have a straight back and sharp teeth to cut objects.
I live above a star who never burns. I have 11 neighbors but they never turn. My initials are p q r and sometimes s.
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
Why was the cook arrested?