Devo's "Space Foam" but not "Space Junk"? Sally, the fictional girl who was killed by space junk (in the Devo song) was even namechecked in New Scientist ("Did Sally die in vain?").

Rush's "Cygnus X-1" was spread over at least two albums, as I recall.

Lots of ELO could be included from the lovely Time album, such as "Ticket To The Moon".

Various Genesis songs (true Genesis, when they had Peter Gabriel) including "Silent Sun", "Watcher of the Skies".

Blur have strong astronomy connections, including a song about celestial bodies ("Far Out") and bass player Alex James' role in the Beagle 2 project, among other things.

A Flock of Seagulls also did a song about Yuri Gagarin, IIRC.

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