Due to the song's connection with science fiction, it is considered by some to be an example of filk music, though it did not emerge from SF fandom.
The lyrics in the song, written by John's long-time collaborator Bernie Taupin, describe a Mars-bound astronaut's mixed feelings at leaving his family in order to do his job. Musically, the song is a highly-arranged pop ballad anchored by John's piano, with atmospheric texture added by synthesizer and processed slide guitar.