If you have no 3D printer, .stl files are viewable in the Mac OS Finder. Just download the file, select it and hit the spacebar: a 3D rendering of the .stl can be rotated.
Are there any particular 3D printers recommended for these NASA models?
As the other comment suggests, any printer will do. For this particular model, I think a 3D printer with "good resolution" will give the best results. So a resin printer will probably give a smoother finished model than a filament printer.
Loaded up the models into my slicer, looks like a pretty straightforward print. Should print on anything "mainstream", I reckon. About 4h worth of printing on my Bambu P1S.