"Have you learned anything about the planet and its people?"

Maybe that said something about the planet they came from.

He had heard about the planet, although he'd never been there.

I know too much about the planet to want to go there.

Is there something here we should know about our own planet?

A man was killed trying to bring me a message about their planet.

It may also be that people care about our planet.

I've known a little about stars and planets ever since I can remember.

"There are a few things I haven't yet told you about the planet."

The painting shows a teacher talking about the sun and planets to his class.