I read the whole thread and listened to all the songs. Some I didn't knew, really good ones. But in my very personal opinion:
I don't think it should be a track that contains the word space, or have very inspiring lyrics, BTW many of us (not english native speakers) won't understand the lyrics.
The older the track is not the better, space closes so should be a track that made history IN space, so not a pop/soul/funk 70's or 80's... theme
I frankly would go for something that has to do with house or techno music with lyrics or not, but that make the place go totally crazy.
Here are some of my choices:
Daft Punk - Rolling and Scratching
Rolando - Jaguar
Josh Wink - Higher State of conciousness
Nevertheless I think they will end with Joe Smooth - Promised Land.
Great thread, keep posting!