Andromeda Galaxy Andromeda Galaxy The Andromeda Galaxy (), also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way. Its name stems from the area of the sky in which it appears, the constellation of Andromeda. The 2006 observations by the Spitzer Space Telescope revealed that the Andromeda Galaxy contains approximately one trillion stars, more than twice the number of the Milky Way's estimated 200 to 400 billion stars. The Andromeda Galaxy's mass is estimated to be around 1.76 times that of the
The Hitchhiker's Guide to the Galaxy (novel) The Hitchhiker's Guide to the Galaxy (novel) The Hitchhiker's Guide to the Galaxy is the first of five books in the "Hitchhiker's Guide to the Galaxy" comedy science fiction "trilogy" by Douglas Adams. The novel is an adaptation of the first four parts of Adams' radio series of the same name. The novel was first published in London on 12 October 1979. It sold 250,000 copies in the first three months. The namesake of the novel is "The Hitchhiker's Guide to the Galaxy", a fictional guide book for hitchhikers (inspired by the "Hitch-hiker's Guide to Europe") written in the form