Orion Nebula

The Orion Nebula is the nearest large star-forming region to Earth and one of the most studied objects in the night sky. Located in the “sword” of the constellation Orion, it is faintly visible to the naked eye as a fuzzy star.

At its core lies the Trapezium Cluster, a tight grouping of four young massive stars whose ultraviolet radiation ionizes the surrounding gas and causes the nebula to glow. The prominent pink-red color in the Hubble imagery comes from hydrogen-alpha emission; the blue-green tones represent doubly ionized oxygen (OIII).

The nebula is part of a much larger molecular cloud complex — the Orion Molecular Cloud — spanning hundreds of light-years. Embedded throughout are hundreds of protostars in various stages of formation, many surrounded by protoplanetary disks (proplyds) visible as dark silhouettes against the nebula’s bright background.

This image reveals extraordinary structural detail: shock fronts, dense knots of gas, and the turbulent boundary between the ionized nebula and the cold molecular cloud behind it.