http://www.spacepolicyonline.com/news/house-hearing-nasa-needs-stability-except-for-adding-back-lunar-surface-missions

http://www.astronomy.com/news/observe-the-solar-system/2017/02/how-big-is-the-biggest-moon

https://www.nasa.gov/feature/nasa-kicks-off-study-to-add-crew-to-first-flight-of-orion-sls-as-progress-continues-to-send

Eagle Spacecraft

Zero X

USS Discovery

Jupiter 2

http://www.astronomy.com/magazine/ask-astro/2016/01/spongy-hyperion

http://acp.dc3.com/planner.html

http://www.bisque.com/sc/pages/TheSkyX-Editions.aspx

http://www.diffractionlimited.com/help/maximdl/Basic_Operation.htm