Answer:
I can travel from there to here by disappearing, and here to there by reappearing.
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
In the evening I'm long, in the morning I'm smallΝΎ When seen in a ballroom, I'm nothing at all.
What is so fragile that saying its name breaks it?