'39

"'39"
The back sleeve of the Italian single sleeve for "You're My Best Friend"
Song by Queen
from the album A Night at the Opera
A-side"You're My Best Friend"
PublishedQueen Music Ltd.
Released18 June 1976
RecordedAugust–November 1975
Genre
Length3:30
Label
Songwriter(s)Brian May
Producer(s)

"'39" is a song by British rock band Queen. Composed by lead guitarist Brian May, it is the fifth track on their fourth studio album A Night at the Opera. The song was also the B-side to "You're My Best Friend".

Inspired by May's studies in astrophysics, the song relates the tale of a group of astronauts who embark on what is, from their perspective, a year-long voyage. Upon their return however, they realise that a hundred years have passed on Earth due to the effects of time dilation from traveling at relativistic speeds, and the loved ones they left behind are now all dead or aged.