"The Altairian dollar is the principal medium of exchange throughout the Milky Way galaxy, partly due to the general incompatibility (and/or illusory nature) of most other forms of currency. A competent hitchhiker should be able to see the galaxy on less than thirty Altairian dollars a day, although costs around the Guide's headquarters do make this, ironically, almost impossible."@en . . "The Altairian dollar is the principal medium of exchange throughout the Milky Way galaxy, partly due to the general incompatibility (and/or illusory nature) of most other forms of currency. A competent hitchhiker should be able to see the galaxy on less than thirty Altairian dollars a day, although costs around the Guide's headquarters do make this, ironically, almost impossible."@en . . "Altairian dollar"@en .