Orion's Horsehead Nebula 3.7

For this week, I chose the picture of the horsehead nebula, in Orion. One of the most famous nebulae in the sky, it is only visible as a dark outline in front of the emission nebula in the center of the photograph. It is actually a dark dust cloud that has assumed a recognizable shape by mere chance. Also visible in the photograph are blue reflection nebulae.