python -m http.server 8000 enter URL "localhost:8000" in web browser (tested with Python 3.6 and Chrome)
Under root /: index.html: main web page
CelestialBody.js: handles recursive rendering of each planet / satellite
gui.js: ui objects and event handlers
SolarSystem.js: creates and maintains data structure for objects in the scene.
./textures: includes image files that are used as textures
./lib: includes external libraries used in the project, such as three.js and TrackballControls.js
Under lib/: dat.gui.min.js Detector.js three_new_min.js TrackballControls.js underscore-min.js