ADAM BLOCK / MOUNT LEMMON SKYCENTER / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY ADAM BLOCK / MOUNT LEMMON SKYCENTER / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY
NGC 2359 nebula. Optical image of the Wolf-Rayet emission nebula NGC 2359, also known as Thor's Helmet. This nebula lies around 40,000 light years from Earth in the constellation Canis Major. A Wolf-Rayet nebula is formed by the ejection of glowing, ionised gas from a hot, central star. These Wolf-Rayet stars lose mass 100 times faster than stars of comparable luminosity and may be a million times more luminous than the Sun. The interaction of the ejected gas with interstellar matter forms a bubble around the star, which glows when ionised by the star's radiation.
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