Outer Space
From Muppet Wiki
Uncle Travelling Matt exploring Outer Space
Outer Space is what Fraggles call the world outside of Fraggle Rock where the Silly Creatures live. Therefore, whereas Doc's Workshop is considered to be part of Outer Space, the Gorgs' Garden is not.
Traveling Matt discovered the once-fabled Outer Space in the first episode of Fraggle Rock, "Beginnings," and has since spent much time exploring it. He regularly sends postcards detailing his adventures to his nephew Gobo.
