https://www.youtube.com/watch?v=lyv8reu21P4

Have you ever made someone you love a mix-tape?

Forty years ago, a group of scientists, artists and writers gathered in a house in Ithaca, New York to work on the most important compilation ever conceived. It wasn't from one person to another, it was from Earth to the Cosmos.

The result was the Voyager Golden Record, a genre-hopping multi-media metal LP. A 90-minute playlist of music from across the globe, a sound essay of life on Earth, spoken greetings in multiple languages and more than 100 photographs and diagrams, all painstakingly chosen by Sagan and his team to create an aliens' guide to Earthlings. The record included music by J.S. Bach and Chuck Berry, a message of peace from US president Jimmy Carter, facts, figures and dimensions, all encased in a golden box.

Join Jonathan Scott as he tells the story of NASA's interstellar mix-tape, from first phone call to final launch, when Voyager 1 and 2 left our planet bearing their hopeful message from the Summer of '77 to a distant future.

In conversation with BBC Radio Ulster's Steven Rainey.