- Slingshot Effect, The
How spacecraft accelerate in planetary flybys by gravity assist.
www.dur.ac.uk/bob.johnson/SL
- Google Book Search: Space Tourism
Offers scientific chapters and articles on space tourism written by Michael Van Pelt, describing everything from what it feels like to be a tourist in space, to be hurled into orbit on top of a controlled explosion, to float around in a spacecraft, and to be able to look down on your hometown from above the atmosphere.
books.google.com/books?id=pjiuMbDxsJIC&dq=space+tourism&printsec=frontcover...
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