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Keywords: planetary nebula, Helix Nebula, NGC 7293
![Туманность Ожерелье](https://images.astronet.ru/pubd/2010/11/03/0001247963/necklace_corradi900c.preview.jpg)
3.11.2010
The small constellation Sagitta sports this large piece of cosmic jewelry, dubbed the Necklace Nebula. The newly discovered example of a ring-shaped planetary nebula is about 15,000 light-years distant. Its bright ring with pearls of glowing gas is half a light-year across.
![Туманность MWP1 "Винная бутыль"](https://images.astronet.ru/pubd/2010/10/21/0001247688/MWP1Web_Goldman900c.preview.jpg)
21.10.2010
The lovely, symmetric planetary nebula cataloged as MWP1 lies some 4,500 light-years away in the northern constellation Cygnus the Swan. One of the largest planetary nebulae known, it spans about 15 light-years. Based...
![Чудные кометарные сгустки в туманности Улитка](https://images.astronet.ru/pubd/2008/04/13/0001227269/helix_hst.preview.jpg)
13.04.2008
What causes unusual knots of gas and dust in planetary nebulas? Seen also in the Ring Nebula, the Dumbbell Nebula and the Eskimo Nebula, the knots' existence was not initially predicted and their origins are still not well understood.
![Планетарная туманность NGC 7027 в инфракрасном свете](https://images.astronet.ru/pubd/2003/09/08/0001192792/ngc7027_hst_big.preview.jpg)
25.03.1998
NGC 7027 is one of the smallest known planetary nebulae. Even so, NGC 7027 is 14,000 times larger than the Earth-Sun distance. Planetary nebula are so named because the first few discovered appeared similar to planets. Planetary nebula are actually dying stars, though, that have recently run out of nuclear fuel.
![Кольцеобразная туманность Шепли-1](https://images.astronet.ru/pubd/2002/08/23/0001179141/shapley1_aat.preview.gif)
12.12.1995
This strange structure is what can result when a normal star runs out of nuclear fuel in its core. At that time, the center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula.
![Кольцеобразная планетарная туманность Шепли-1](https://images.astronet.ru/pubd/2004/08/09/0001198953/shapley1_aat.preview.gif)
9.08.1998
What happens when a star runs out of nuclear fuel? The center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. This particular planetary nebula, designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure.
![NGC 2440: кокон молодого белого карлика](https://images.astronet.ru/pubd/2006/03/08/0001212121/ngc2440_hst2_big.preview.jpg)
3.07.1999
Like a butterfly, a white dwarf star begins its life by casting off a cocoon that enclosed its former self. In this analogy, however, the Sun would be a caterpillar and the ejected shell of gas would become the prettiest of all!
![Шепли-1: кольцеобразная планетарная туманность](https://images.astronet.ru/pubd/2003/06/21/0001191081/shapley1_aat.preview.gif)
15.02.1997
What happens when a star runs out of nuclear fuel? The center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. This particular planetary nebula, designated Shapley 1 after the famous astronomer Harlow Shapley, has a very apparent annular ring like structure.
![Пузырь в Лебеде](https://images.astronet.ru/pubd/2008/11/13/0001231810/UndesignatedBubbleFC_kbqmh800.preview.jpg)
13.11.2008
Adrift in the rich star fields of the constellation Cygnus, this lovely, symmetric bubble nebula was only recently recognized and may not yet appear in astronomical catalogs. In fact, amateur astronomer Dave Jurasevich identified...
![Туманность Кошачий глаз](https://images.astronet.ru/pubd/2006/11/12/0001217699/catseye_hst_big.preview.jpg)
31.10.1999
Three thousand light-years away, a dying star throws off shells of glowing gas. This image from the Hubble Space Telescope reveals The Cat's Eye Nebula to be one of the most complex planetary nebulae known.
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