Thor’s Helmet Nebula - NGC 2359 (also known as Thor's Helmet) is an emission nebula in the constellation Canis Major. The nebula is approximately light-years away and 30 light years in size. The central star is the Wolf-Rayet star HD 56925
This once-in-a-lifetime image shows a pair of gravitationally interacting galaxies called Arp The galaxy on the left, is relatively undisturbed, whereas the galaxy on the right, is a messy ring of intense star formation. Image: NASA/ ESA/ M.