If you live in Australia, then you've probably already know this: tonight, a cosmic alignment of the planets and the moon will result in a smiley sky!
From soon after 8pm until just before 11pm the planets Venus and Jupiter will stare down from the western sky like two brilliant eyes. Directly below, the crescent moon will form a happy mouth.
"I think it will be very spectacular," Sydney Observatory's astronomer, Nick Lomb, said. "The three brightest objects in the night sky will all be in the same patch of the sky."
As the night draws on, Dr Lomb predicted, "the smiley face" - with Venus playing the left eye and giant Jupiter the right - "will improve and become a little more compact".