Answer:
I'm a god. I'm a planet. I measure heat.
I can be written, I can be spoken, I can be exposed, I can be broken.
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
The stack just might be sent all over. Full of what's new, yet it's nearly obsolete.
I am your mother's brother's only brother in law. Who am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?