The Heart Nebula (upper right; IC 1805, Sh2-190), and Soul Nebula (lower left; IC 1848, Westerhout 5, LBN 667, Sh2-199) are large clouds of glowing gas. Both are in Cassiopeia and about 7,500 light years away in the Perseus arm of the Milky Way galaxy. The Heart Nebula is about 165 light years in diameter, with the Soul being a little smaller. To the upper right of the image is the Fishhead Nebula (IC 1795, NGC 896), while the open cluster Melotte 15 lies at the centre of the Heart nebula. That cluster is responsible for causing the hydrogen in this region to glow.
In addition to the main subjects of the image, there are numerous other catalogued objects in this shot that are interesting in their own right.
http://astrodoc.ca/heart-soul-wide/Clear skies,
Ron
