In the star-forming region W5, the oldest stars can be seen as blue dots in the centers of the two hollow cavities (other blue dots are background and foreground stars not associated with the region). Younger stars line the rims of the cavities, and some can be seen as pink dots at the tips of the elephant-trunk-like pillars. The white knotty areas are where the youngest stars are forming. Red shows heated dust that pervades the region's cavities, while green highlights dense clouds.
Located about 7,500 light-years away in the constellation of Cassiopeia, the Heart Nebula is a mix of gas and dark dust. Also called IC 1805, this emission nebula was nicknamed for its heart-like shape. In the center of the heart is a newly-formed star cluster called Melotte 15. The image also shows a bright star-forming region called NGC 896. The larger star-forming complex that contains the heart nebula sprawls along the Perseus spiral arm of our home galaxy, the Milky Way.
The Prawn Nebula. Located around 6000 light-years from Earth in the constellation of Scorpius (The Scorpion), the nebula formally known as IC 4628 is a huge region filled with gas and clumps of dark dust. These gas clouds are star-forming regions, producing brilliant hot young stars. The Prawn Nebula is around 250 light-years across, covering an area of sky equivalent to four times that of the full Moon. The nebula is also known as Gum 56, after the Australian astronomer Colin Gum.