Thor’s Helmet Nebula
NGC 2359, which is known as Thor’s Helmet Nebula is an emission nebula. It can be found in the constellation Canis Major – which is one of the hunting dog constellations near Orion. This nebula is about 15,000 light years away and is about 30 light years in size.
Thor’s Helmet is a lot like the Bubble Nebula. It has a Wolf-Rayet star in the center which is an extremely hot giant thought to be in a pre-supernova stage. The nebula gets it’s shape from the star’s interaction with a nearby large molecular cloud.
As you can see in the above image, the Wolf-Rayet star (GSC 5407:3417) has created a large bow shock in the nebula which gives the helmet it’s unique shape.
If you take a look at the picture to the right, you can see how this interesting nebula got it’s name!