Answer:
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
I'm a god. I'm a planet. I measure heat.
My first is an insect; my second is a border; my whole puts the face in a tuneful disorder.
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
I fly to any foreign parts assisted by my spreading wings. My body holds an hundred hearts Nay I will tell you stranger things when I am not in haste I ride and then I mend my pace anon.