development environment from
http://japan.unity3d.com/
Nunber of space debri from
https://www.orbitaldebris.jsc.nasa.gov/quarterly-n...
image of debri from
https://www.orbitaldebris.jsc.nasa.gov/photo-galle...
3d model from
https://nasa3d.arc.nasa.gov/models
https://www.turbosquid.com/
https://free3d.com/
SpaceApps is a NASA incubator innovation program.