Possible Clues:

• Unable to find patch in the sky
• Gas/dust cloud in space
• How heavenly to be in The Naul!
• Cloud of gas, stars
• Unable to be like a distant galaxy
• Misty appearance in the heavens
• Bright patch in sky caused by distant galaxy.
• Hazy light; a slight cloudiness
• Award won by Asimov, Herbert and Le Guin
• Cloud of gas and dust