Raymond HIll - Author

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Some interesting Sites:

http://www.braeunig.us/space/index.htm

http://www.relativitycalculator.com/rocket_equations.shtml

http://www.flightradar24.com/

http://flyingmachines.ru/Images7/Flight/1911/243-1.jpg

http://www.astronomyforbeginners.com/astronomy/

http://www.hq.nasa.gov/alsj/a11/a11MIssionReport_1971015566.pdf

http://kerbalspaceprogram.com

http://www.youtube.com/watch?v=oyrEBO8sT3

http://www.mathtutor.ac.uk

https://www.angieslist.com/articles/amateur-astronomy-home.htm