The Horsehead Nebula is a cloud of ionized-hydrogen in the constellation Orion. These clouds are lit from within by young, hot stars. The interstellar dust absorbs the light from part of the ionized cloud creating this beautiful contrast. Image Credit: NA
Pismis located at the core of small open star cluster Pismis can be seen in this image provided by NASA and ESA. The star cluster Pismis 24 lies in the core of the large emission nebula NGC 6357 that extends on the arm of the Sagittarius constellation.