“Out of the blue” is an informal English idiom that describes an event that occurs unexpectedly, without any warning or preparation. It is used as an adverb. The “blue” in the phrase refers to the sky, one from which a sudden thunderstorm is unexpected.
Planets made in GIMP.Done in PSE7 and Picnik. Background is a downloadable N.A.S.A image.
For more interstellar art see my SPACE AGE COLLECTION