Who said the sky is the limit?
NASA SpacePlace
This free website may turn your kiddo into a space lover, or at least arouse curiosity about what is beyond the skies. NASA has outdone itself in creating informative and entertaining content about space and the science and tech used there, in a way that is accessible to even 4-year-olds. It does require literacy so it won’t be a great experience for non readers without help. There are games, and exploration questions like How does GPS work? and why poor Pluto got demoted from planet status. Screen time you can truly feel good about.