Nebulae

Horsehead Nebula
The Horsehead nebula is part of the larger Orion nebula; it is a dense, dark nebula where star formation is taking place. The nebula can be seen in relief against the bright background of the IC 434 emission nebula.

Swan Nebula
The Swan Nebula is a region of ionized hydrogen, known as an HII region, in the constellation of Sagittarius.

Trifid Nebula
The Trifid Nebula is named for the three bright sections delineated by the dark nebula at its center. It is a large star forming region.

Pacman Nebula
NGC 281 is an emission nebula located in the constellation Cassiopeia. It is part of the Perseus Spiral Arm in the Milky Way Galaxy.