Hearts of Space is a United States weekly syndicated public radio show featuring music of a contemplative nature drawn largely from the ambient, new-age and electronic genres, while also including classical, world, Celtic, experimental, and other music selections. For many years, the show's producer and presenter, Stephen Hill, has applied the term "space music" to the music broadcast on the show, irrespective of genre. It is the longest-running radio program of its type in the world. Each episode ends with Hill gently speaking a catchphrase: "Safe journeys, space fans...wherever you are."