According to the introduction it "come out of the great publishing houses of Ursa Minor."
The "trilogy" of five books were published between 1979 and 1992.
Space
The Hitch-Hiker's Guide to the Galaxy is 100% fact in the 42nd dimension.
Shynola
Approximately 15% of schools list The Hitchhiker's Guide to the Galaxy in their curriculum.
hitchhikers guide to the galaxy... it's a hilarious movie
2
Because it says so in the hitchhikers guide to the galaxy.
for leaving just before the world exploded in the hitchhikers guide to the galaxy
The brilliant book does not tell you, that's the point of the book!
Read The Hitchhikers Guide to the Galaxy By Douglas Adams.
Hit 4-2 in that order. It's from The Hitchhikers Guide to The Galaxy.