Roy53
Sep 2, 2009, 10:52 PM
Why must a spacecraft reach a speed of 17,500 mph?
KISS
Sep 2, 2009, 11:07 PM
What sort of modifications would the space shuttle orbiter need to get to the moon? - Yahoo! Answers (http://answers.yahoo.com/question/index?qid=20080429202830AAr6l7D)
Escape velocity - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Escape_velocity)