M57 or the ring nebula is a planetary nebula the glowing remains of a sun like star. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a star in the last stages of its evolution before becoming a white dwarf.
Theyre among the most beautiful and colorful objects in the sky.
Ring nebula. Planetary nebulae are formed when a dying red giant star expels its shell of ionized gas to form the nebula while the star itself becomes a white dwarf a dense stellar remnant roughly the size of the earth. Its classic appearance is understood to be due to our own perspective though. The ring also known as m57 is a planetary nebula one of an estimated 10000 or more believed to populate the milky way galaxy but fewer than 2000 have been cataloged.
The core of the star remains in the form of white dwarf it ionizes the surrounding gas producing an impressive light display. The recent mapping of the expanding nebulas 3 d structure based in part on this clear hubble imageindicates that the nebula is a relatively dense donut like ring wrapped around the middle of a american football shaped cloud of glowing gas. The ring nebula is one of only four planetary nebulae listed in messiers catalogue along with the dumbbell nebula m27 the little dumbbell nebula m76 and the owl nebula m97.
The ring nebula also catalogued as messier 57 m57 or ngc 6720 is a planetary nebula in the northern constellation of lyra. The ring nebula is a planetary nebula these type of nebula are created when a small star sheds it mass at the end of its life span. The recent mapping of the expanding nebulas 3 d structure based in part on this clear hubble imageindicates that the nebula is a relatively dense donut like ring wrapped around the middle of a american football.
It was discovered in 1779 by the french astronomer augustin darquier. The view from planet earth looks down the long axis of the football face on to the ring. The nebula is approaching earth at 21 kms.
Like other nebulae of its type called planetary nebulae it is a sphere of glowing gas thrown off. The ring nebula is about 2000 light years from earth and measures roughly 1 light year across. The tiny white dot in the center of the nebula is the stars hot core called a white dwarf.
The ring nebula m57 ngc 6720 is a planetary nebula in the constellation of lyra. Previous observations by several telescopes had detected the gaseous material in the rings central region. Ring nebula catalog numbers ngc 6720 and m57 bright nebula in the constellation lyra about 2300 light years from the earth.
The nebula is well known for its spectacular colours. Except for the rings of saturn the ring nebula m57 is probably the most famous celestial band. Located in the constellation lyra the nebula is a popular target for amateur astronomers.
It is one of the four planetary nebulae in the messier catalogue.
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