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Messier 57: Difference between revisions
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[[File:375px-M57 The Ring Nebula.JPG|thumb|Messier 57 or Ring Nebula]] | [[File:375px-M57 The Ring Nebula.JPG|thumb|Messier 57 or Ring Nebula]] | ||
The Ring Nebula (also catalogued as Messier 57, M57 or NGC 6720) is a planetary nebula in the northern constellation of [[Lyra]]. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf.Messier 57 is located south of the bright star [[Vega]], which forms the northwestern vertex of the Summer Triangle asterism. The nebula lies about 40% of the distance from Beta (β) to Gamma (γ) Lyrae,making it an easy target for amateur astronomers to find. | The Ring Nebula (also catalogued as Messier 57, M57 or NGC 6720) is a planetary nebula in the northern constellation of [[Lyra]]. Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf.Messier 57 is located south of the bright star [[Vega]], which forms the northwestern vertex of the Summer Triangle asterism. The nebula lies about 40% of the distance from Beta (β) to Gamma (γ) Lyrae,making it an easy target for amateur astronomers to find. | ||
M57 is an example of the class of planetary nebulae known as bipolar nebulae, whose thick equatorial rings visibly extend the structure through its main axis of symmetry. It appears to be a prolate spheroid with strong concentrations of material along its equator. From Earth, the symmetrical axis is viewed at about 30°. Overall, the observed nebulosity has been currently estimated to be expanding for approximately 1,610±240 years.<ref>[http://en.wikipedia.org/wiki/Ring_Nebula Ring Nebula]</ref> | M57 is an example of the class of planetary nebulae known as bipolar nebulae, whose thick equatorial rings visibly extend the structure through its main axis of symmetry. It appears to be a prolate spheroid with strong concentrations of material along its equator. From Earth, the symmetrical axis is viewed at about 30°. Overall, the observed nebulosity has been currently estimated to be expanding for approximately 1,610±240 years.<ref>[http://en.wikipedia.org/wiki/Ring_Nebula Ring Nebula]</ref> | ||
==HGS Session References== | |||
HGS Sessions - Clearing [[Temple Mount, Jerusalem.]] - 3/20/2015 <ref>HGS Session</ref>HGS Sessions - Clearing [[Sexual Misery, Breeder Programs]] - 3/31/2015 <ref>HGS Session</ref> | |||
==References== | ==References== | ||