Orla,
Chris Hadfield’s videos might be perfect for your astronaut role play on day 1.
His “Chris’ Kitchen” outlines the difficulty with crumbs in space and explains why the ISS occupants eat tortillas instead.
The links from the Canadian Space Agency offer additional images and infographics: https://www.asc-csa.gc.ca/eng/multimedia/search/video/17836
Have you a particular Brian Cox video you prefer? This one is of a talk to primary children, but is quite long: