Maeve,
You can bring inquiry into this activity by recording the children’s predictions about the conditions on other planets based on their understanding. They might think that planets that are close to their Sun are hotter than planets that are further away. They could then verify this – a simple and quick inquiry process adapted from the Framework for Inquiry.
Flying Tiger currently have a cute set of alien pencils and bookmarkers that might be nice items to have in the classroom when you take your Alien Worlds tour.
You could also share these exoplanet travel posters from NASA, which have guided tours (for example: https://exoplanets.nasa.gov/alien-worlds/exoplanet-travel-bureau/hd-40307g-guided-tour/) a commentary on the art and also colouring pages that let the children express their own views on how the planet might look.