I teach 8th grade. Many of my students have been amazed to learn recently that our Galaxy is called the Milky Way, that this isn't the only galaxy, that our sun is not at the center of our galaxy, and that no people or even space probes have left our galaxy. I especially love to watch their faces when I show them a picture of the Hubble Deep Field North and say that every point of light in the picture is a galaxy, then explain just how small an amount of the sky that the picture covers.
A childhood belief about physics

others believed things like this
- I used to dig a super deep hole thinking it
would transport me to the galaxy — Rafaella - I thought "The Hitchhiker's Guide to the Galaxy" was a somewhat casual manual for astronauts.— Katya
- When I was about maybe...8 i used to think that picturesque was pronounced picture-skwehAnon
- When I first saw a picture of the human anatomy, I thought the brain was really snot.Anon
- I used to believe that God looked exactly like the picture of Abraham Lincoln on an American penny.— Leah
- i used to believe that shredded wheat was harvested from niagara falls because of the picture on the box— gord