The songs here should all be on any space-related playlist.

Not strictly space songs, but the following can be interpreted as being about space and are very good anyway:

Wicked- Defying Gravity
Starship- Build This Dream Together
John Parr- Man in Motion (St. Elmo's Fire)

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I want to go back to the moon.
I don't care which rocket you use, whichever one you pick, I'll like it, I swear.
"If you think the LHC will create black holes, you might as well believe Hobbits are at the bottom of your garden."- Dr. Mike Inglis
Rovers forever! - ToSeek