Astronomy Picture of the Day

Explanation: Is the heart and soul of our Galaxy located in Cassiopeia? Possibly not, but that is where two bright emission nebulae nicknamed Heart and Soul can be found. The Heart Nebula, officially dubbed IC 1805 and visible above on the right, has a shape reminiscent of a classical heart symbol. Both nebulae, shown above in false colour, shine brightly in the light of energized hydrogen. Several young open clusters of stars populate the image and are visible above in and around the nebula centres. Light takes about 6,000 years to reach us from these nebulae, which together span roughly 300 light years. Studies of stars and clusters like those found in the Heart and Soul Nebulae have focussed on how massive stars form and how they affect their environment.