"Depending on their age, we might look at the solar system, I've got movies and slides showing the solar system.
"We look at what's in the sky at the moment so the kids can take their parents outside at home and show them what they've learned.
"I've had 10-year-olds that have never had a good look at the night sky because their parents think it's not safe to be outside.
"My attitude is show your parents what you've learned, the kids think it's marvellous knowing more than their parents."
The children get to hold meteorites - something real from space they can actually touch.
The dome is collapsible and fits into a large bag.
Ms Witheford takes it to schools in the North Island and covers the part of the school curriculum about astronomy.