What's a Black Hole?

Aura asked Daddy what a black hole was. He scared himself answering. She did not.

At dinner, Aura asked Daddy a question.
"What's a black hole?"
Daddy got excited. He started to explain.
A black hole, he said, is a place in space where gravity is so strong that nothing can escape. Not a spaceship. Not a star. Not even light. Light is the fastest thing in the universe and even light cannot get out. Once something falls in, it never comes back.
Daddy's eyes got very big as he said this. He started to wave his hands. His hair got slightly wild.
Aura watched him calmly. She put her chin in her hands.
"Could one eat us?"
Daddy paused.
He wanted to be honest. But he did not want to scare Aura.
"...Not for a really, really long time," he said.
"Like, after dinner?"
"After... billions of dinners."
Aura thought about that.
"Okay," she said. "We're fine."
She picked up her fork and went back to eating.
The nearest black hole is hundreds of light-years away from Earth. That is a very, very long way. Far enough that Aura will be fine tonight. Far enough that you will be fine too.
Eat your dinner.