Hawkwind, believe it or not were not named after some mythological Norse character, but after the bad habits of Nik Turner from his gross habit of clearing his throat (hawking) and excessive farting
They also sometimes played with another great band of the late 60's/early 70's, the Pink Fairies, combining at tomes as "Pinkwind"
On a serious note Hawkwind are celebrated as one of the first 'space rock' bands, a prog genre also sometimes inhabited by Pink Floyd and certainly by David Bowie
The philosophy of the band was really cemented with their second album, 1971's In Search of Space. Science fiction author Michael Moorcock served as a science fiction consultant to the band, hence "Silver Machine" and the constant references to the cosmos
The band was also famous, like the Grateful Dead, of encouraging the free taping of their concerts. This all stopped, however, in their recent 2008 reunion tour, a sore-point with many fans.
Check them out !