Are They Learning About Planets at School?

I was mailing Grandparent's Day papers that the kids made at school and this conversation entailed:

Ash:  Where do Grandma and Pappy live?

Me:  Far away

Ash:  On another planet?

Me:  No a place called Pennsylvania

Ash:  No you're joking.  They live on another planet.  I think they live on the one that is hot and red.