
ALT The Heart and Soul nebulae are seen in this infrared mosaic from NASA's Wide-field Infrared Survey Explorer (WISE). The nebula to the right is the Heart, designated IC 1805 and named after its shape resembling a human heart. To the left is the Soul nebula. Both nebulae appear as green bubbles of gas lined by wispy, white clouds. Inside each are splotches of fiery red gas. Vibrant blue stars litter the entirety of the scene. Credit: NASA/JPL-Caltech/UCLA

ALT Cassiopeia A, a circular cloud of gas and dust with complex structure. The inner shell is made of bright pink and orange filaments studded with clumps and knots. Around the exterior of the inner shell, particularly at the upper right, there are curtains of wispy gas that look like campfire smoke. The white smoke-like material also appears to fill the cavity of the inner shell, featuring structures shaped like large bubbles. Around and within the nebula, there are various stars seen as points of blue and white light. Outside the nebula, there are also clumps of yellow dust, with a particularly large clump at the bottom right corner that appears to have very detailed striations.

























