I've been looking for a way to deepen and extend our Astronomy lessons. We're using Apologia's Astronomy and it's working wonderful for the 4th, 2nd & K -- but Dd#1, 6th grade, has already absorbed most of the information from her independant reading. So, I as we progress through each chapter, I'm making montessori cards for her (and the others) to extend the lesson. She colored 6 cards of a sun and then using a diagram I found online, sketched in corona, core, convection zone, etc. I copied the cards so she has duplicates and she can match the picture with the label and match the label with the definition. I think it'll help!