Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2013 September 23 IC 4628: The Prawn Nebula Credit: ESO; Acknowledgement: Martin Pugh Explanation: South of Antares, in the tail of the nebula-rich constellation Scorpius, lies emission nebula IC 4..