Answer:
I'm a god a planet and a measurer of heat. Who am I?
I work when I play and play when I work
I run smoother than any rhyme, I love to fall but cannot climb. What am I?
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see. What am I?
I am taken from a mine and shut in a wooden case from which I am never released. Yet I am used by almost everybody. What am I?
When is it bad luck to see a black cat?