What data is used to determine whether lengthy human spaceflight and space colonisation can be done ?
Capturing the High Ground : The U.S. Military in Space , 1987-1995 , Part 2 Countdown , May / June 1995.CORONA : America ’s First Spy Satellite , Part 1 , Quest , Summer 1995.CORONA : America ’s First Spy Satellite , Part 2 , Quest , Fall 1995 .