Observations of the Orion-Eridanus superbubble and its nested bubbles. The white, green dashed, and red dash-dotted circles illustrate the approximate outline of the Orion-Eridanus superbubble, dust ring, and Barnard’s loop on the plane of the sky, respectively. The light green and orange background colors represent the observations of thermal dust (at 545 GHz) obtained by the Planck Space Observatory and Hα emission (Finkbeiner 2003), respectively. The bright green region shows Orion A.