The company littleBits has developed an open source collection of electronic modules that snap together with magnets to make all sorts of fun gadgets. They have collaborated with NASA to create a SpaceKit package: Build Your Own Mini Mars Rover With These Brilliant, NASA-Approved Blocks – Design.WIRED
The package includes “12 modules, 5 NASA lesson plans and 10 STEAM activities”. With it you can assemble a Mars Rover:
A space helmet:
The Space Booklet (pdf) describes the SpaceKit and several projects based on it.
This video shows a sampling of space projects: