Urania's trust and most abiding love was the dark night sky, but that blazing sunlight came a very close second. Not that she liked to let Apollo be too aware of that. His ego had certainly never needed all nine of the muse sisters fawning over him to be just as he was.
But, in all honesty, that smile made her want to kiss him and forget everything else in the world. Gods above and below, he was so beautiful and intoxicating- it was very bothersome for Urania, who liked to imagine herself above such base ideas as 'being so horny you might die'.
So instead of giving him the compliment he desired, or immediately throwing her arms around him (the other thing he desired), Urania asked: "where did you watch the comet from?"