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I do a bit of outreach and have young kids too. At preschool age I feel they are still only just comprehending the earth as a sphere.
They are interested to hear about the orbits of the earth, moon and sun as these are tangible things they can see and feel. But deep space can be a bit abstract for them. They can understand stars a bit via comparison to Sol but the scales are lost on them.
I like to tell them about how stars are made with nebula photos but you can't really use the term "star nurseries" or "where stars are born" because they don't really know what birth is (and you don't want to have to explain that!)
Anecdotally kids are most interested to hear about aliens, space travel and black holes. These are the "fun" topics for them and I get peppered with questions about them every time. This is what they get exposed to most via fiction/kids books/tv I guess.
Hope this helps, sorry I don't have any resources, I just wing it!
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