The Hitchhiker's Guide to the Galaxy a human-like alien writer for the eccentric, electronic travel guide "The Hitchhiker's Guide to the Galaxy", by hitchhiking onto a passing Vogon spacecraft. Following his rescue, Dent explores the galaxy with Prefect and encounters Trillian, another human who had been taken from Earth prior to its destruction by the President of the Galaxy, the two-headed Zaphod Beeblebrox, and the depressed Marvin, the Paranoid Android. Certain narrative details were changed between the various adaptations. The various versions follow the same basic plot but they are in many places mutually contradictory, as Adams rewrote the story substantially for each new adaptation. Throughout
Places in The Hitchhiker's Guide to the Galaxy member of the Alpha Centauri system. The first novel points out that it is four light years from Earth's solar system to Alpha Proxima, whilst Damogran is five hundred thousand light years away. The Altairian dollar is one of three freely convertible currencies in the galaxy, though by the time of the novels it had apparently recently collapsed. The "Hitchhiker's Guide to the Galaxy" advertises itself as the best resource for those who wish "to see the galaxy for less than thirty Altairian dollars a day". According to the Hitchhiker's Guide TV series, one Altairian "long way" is equal to