Historical Fact

[Loic Dachary]

  I'm writing a historical summary of UNIX life. Reliable sources are
difficult to find. The differences between stories and dates make this
work hard and confusing.
  I found two different opinions about K. Thompson's Space Travel
program. I quote them here :

  - From 'A user to the Unix System, Rebecca Thomas, Jean Yates'

... It simulated the movement of the major celestial bodies
in the solar system....

  - From 'The design of the Unix operating system, M. J. Bach'

... he wrote a game program, "Space Travel", in Fortran for a GECOS system
(the Honeywell 635), but the program was unsatisfactory because it was 
difficult to control the "sapce shop" and the program was expensive to run...


  Does anybody have a pertinent opinion on this futile subject ?