"My God - It's full of stars!"

So this morning I woke up and had the phrase, "My God-It's full of stars!" stuck in my head. (Bonus points to someone who can tell me the name of the book that this line is from.) Now, I have never actually read this book before, or seen the movie from beginning to end. I have seen bits and parts scattered throughout my life, and have heard references to passages. I found this odd.