Here's a picture of the golden record from NASA's website:
After I saw this and confirmed what it was, I remembered the EPK video for Alone in the Universe in which Jeff Lynne explains that Voyager 1 inspired the title track:
I feel it's also worth mentioning that one of the pieces of music on the golden record is Chuck Berry's "Johnny B. Goode."
While writing about the gatefold, I might as well note that the cover of Jeff Lynne's Long Wave album is one of the pictures taped on the wall:
The radio on the floor in the Alone in the Universe gatefold also resembles the radio in the inside picture of Long Wave: