The broad skyscape itself covers about 1.5 degrees or 3 full moons toward the constellation Canis Major. A close look at the lower left corner of the image might identify the object of the cosmic stare as a faint, round nebula. Heroically sized even for a Norse god, Thor's Helmet is about 30 light-years across. The helmet is actually more like an interstellar bubble, blown as a fast wind from the bright, massive star near the bubble's center sweeps through a surrounding molecular cloud. Known as a Wolf-Rayet star, the central star is an extremely hot giant thought to be in a brief, pre- supernova stage of evolution. In contrast, the faint, round nebula is a planetary nebula, the gaseous shroud of a dying lower mass star. The distance to Thor's Helmet is estimated to be about 15,000 light-years.
1998 1999 2000
2001 2002 2003
2004 2005 2006
2007 2008 2009
2010 2011 2012
2013 2014 2015
2016 2017 2018
2019 2020 2021
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Publikacii s klyuchevymi slovami:
NGC 2359 - planetary nebula - Wolf-Rayet star - Planetarnaya tumannost' - zvezdy Vol'fa-Raie
Publikacii so slovami: NGC 2359 - planetary nebula - Wolf-Rayet star - Planetarnaya tumannost' -