Luigi La Bella from Melilli, Italy The Lobster Claw Nebula (Sharpless 2-157) is a faint emission nebula straddling the constellations Cassiopeia and Cepheus. This complex of gas and dust has been sculpted by the massive stars of the Cassiopeia OB2 association — including the Wolf-Rayet star WR 157 — whose winds carve its ring-shaped northern Continue reading "Clawing through Cassiopeia" The post Clawing through Cassiopeia appeared first on Astronomy Magazine .