Picture of the Day

Thor’s Helmet

This image of Thor’s Helmet, or formally NGC2359, was obtained with the wide-field view of the Mosaic camera on the KPNO 0.9m-meter telescope at Kitt Peak National Observatory. Thor’s Helmet is a giant bubble that is being blown off of the Wolf-Rayet star HD 56925. Wolf-Rayet stars are extremely massive stars that are very hot and luminous. Their intense energy blows off the outer layers, causing the bubble shape seen here. The complex shape of the bubble is due to its interaction with dust and gas in which the star is embedded.

Visit Website | Image credit: T.A. Rector (University of Alaska Anchorage) and NOAO/AURA/NSF