About a conversation with my neice (8yo):
Last night after tea Jenny said there should be a little space ship with a camera on the front sent out into space into the universe to keep on going to get to the end as she didn't think the universe could go on for ever. I said if it didn't go on for ever then it would have an edge, like at the end of it. And there would have to be something on the other side of the edge, even if it was nothing. She thought really hard about it, and then said she'd have to go and do something else because thinking about it was making her brain dizzy.