Make your own moon sand
A sensory tub (here's an example but you may need to adjust for age appropriateness)
http://countingcoconuts.blogspot.com...playdough.html
The playdoh in the above example
Sponge painted "stars" on black paper (cut sponges to shape, use silver, white, and yellow paint)
Get a large cardboard box, pretend it's a rocket, and play "blast off"
Space story books