Javascript Libraries
Sweet Alert: https://sweetalert2.github.io/
Jquery: https://jquery.com/
Font Awesome: https://fontawesome.com/
Graphics Engine
Three JS: https://threejs.org/
Orbital Parameters
Basic Data of Planetary Bodies: ftp://ftp.mpe.mpg.de/pub/LB_chapter_4.2._final.pdf
Images
Planet Pixel Emporium: http://planetpixelemporium.com/
3D Models
3D Asteroid Catalogue: https://space.frieger.com/asteroids/
Rocinante: https://sketchfab.com/models/5cc7b9ac82db44a18aa9d37afe1498d2
Apollo CSM: https://www.thingiverse.com/thing:307164
Maths
Interplanetary Transfer: http://www.braeunig.us/space/interpl.htm
Relativistic Acceleration: http://www.physik.uni-leipzig.de/~schiller/ed10/Uniform%20relativistic%20acceleration.pdf
Verification
Heavens Above: http://www.heavens-above.com/
SkySafari 5: https://skysafariastronomy.com/
All images and models public domain and/or creative commons