I would base my lesson on the space and aliens activity set.
Students would learn basic facts about Mars using picture books about space and Mars as a prompt, e.g. The Darkest Dark by Chris Hadfield. I would show them posters and images of Mars, pointing out its red color, surface features like craters and volcanoes, and its two moons.
Class discussion and questioning, eg. “What do you think it would be like to visit Mars?” and “What kind of aliens might live there?”
I would provide students with red and orange construction paper, markers, crayons, scissors, and glue. Ask them to create their own alien that might live on Mars. What would their alien would need to survive on Mars. Will it have extra arms for digging? Big eyes for seeing in the dark? The children could build a Mars rover using a small box and foil. They could use playdoh to create the surface of Mars.
To reflect and assess the children could present their aliens, rovers and landscapes of Mars to the class.