Related Clues:

• Andromeda, for one
• Gassy cloud
• Spiral in space
• Star group
• Cloud of gas and dust
• Literally, ''cloud''
• Star system
• Interstellar matter
• Milky Way, e.g.
• Astronomer's find
• Outer-space cloud
• Award won by Asimov, Herbert and Le Guin
• Group of stars
• Impressive assemblage
• Interstellar dust cloud