Astronomy Picture of the Day

Explanation: The Orion Nebula (M42) shows a host of treasures when viewed in infrared light. Some stars in the Trapezium, an open cluster of stars at the centre, are only visible in infrared light. The orange feature above centre is called the Kleinman-Low Nebula, and appears greatly affected by newly forming central star IRc2. The blue emission in this representative colour photograph is caused by hot gas ionized by the Trapezium stars. This is one of the first photographs ever taken through Japan's new Subaru Telescope.