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. 2002 August 7 Gomez's Hamburger: A Proto-Planetary Nebula Credit: Arturo Gomez (CTIO/ NOAO), Hubble Heritage Team, NASA Explanation: What, in heaven, is that? Sometimes astronomers see things on the sky they don't immediately understand. In 1985 this happened to Arturo Gomez, and the object became known as Gomez's Hamburger for its distinctive yet familiar shape. After some investigation, the object was identified as a proto-planetary nebula, a gas...