In case anyone doesn’t know… Nasa offers up files for 3D printing an viewing etc. here: http://www.nasa.gov/image/ames/take-new-horizons-for-a-spin-and-print-your-own-model
As for an Inventor exercise, you can open the .stl files and save them as parts (.ipt) and then assemble them in an assmbly (.iam). They come in as “Imported Components” and so the only way I found to constrain them was with “mate constraints” using their origins and offsets (I couldn’t use “insert” constraints like I wanted to, inventor didn’t see the objects’ features)
Unless someone out there has a better suggestion on constraining Imported Components? (maybe I’m missing something)
Anywho, it was a fun exercise and I have attached some screen shots.