The 30 Doradus Nebula in the Large Magellanic Cloud.
Caption: If this enormous complex of stars, gas and dust were at the distance of the Orion Nebula it would be visible during the day and cover a quarter of the sky. While the Orion Nebula contains a mere handful of the hot blue stars which energize it, the 30 Doradus Nebula has spawned many thousands in the region shown here. Like the Orion Nebula, the 30 Doradus region is a naked-eye object for the keen sighted. It is however over one hundred times more distant! The 30 Doradus Nebula is by far the biggest star-forming region of the Large Magellanic Cloud and is much more massive than any of the many similar objects known in our own Galaxy.