NASA installed "squawk boxes" in the homes of the Apollo 8 astronauts, so their families could listen in on communications between mission control and the capsule as it traveled thousands of miles across space.
The three astronauts also recorded their conversations with an onboard tape recorder.
Listen to excerpts from Apollo 8's onboard recordings.
Want your own squawk box? Launch the Command Module Radio to stream a selection of short Apollo 8 clips from your desktop.