MSU Solar System

MSU Solar System is the first assignment in the online Coursera class, "Game Design and Development 1," offered by Michigan State University.  I have built the project as instructed with a few added features:

1. The model now includes all recognized planets in our solar system with relative sizes and speeds (estimated and modified to make fit within camera view. i.e. the sun is way too big to use its actual size).
2. The user may now zoom in and out by scrolling with their trackpad or mouse wheel.
3. The comet spawner has a randomized rotation which provides a more varied trajectory for each comet.