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Keywords: planetary nebula, NGC 7293
![Туманность Медуза](https://images.astronet.ru/pubd/2012/10/26/0001271579/medusa_franke900.preview.jpg)
12.06.2010
Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation.
![В сиянии α Центавра](https://images.astronet.ru/pubd/2012/06/28/0001266520/AlphaCenHe2111_lorenzi900.preview.jpg)
28.06.2012
The glare of Alpha Centauri, one of the brightest stars in planet Earth's night sky, floods the left side of this southern skyscape. A mere 4.3 light-years distant, Alpha Centauri actually consists of two component stars similar in size to the Sun, locked in a mutual orbit.
![Гало вокруг Кошачьего глаза](https://images.astronet.ru/pubd/2012/08/31/0001269574/CatsEyeGoldman900.preview.jpg)
31.08.2012
The Cat's Eye Nebula (NGC 6543) is one of the best known planetary nebulae in the sky. Its haunting symmetries are seen in the very central region of this tantalizing image, processed to reveal the enormous but extremely faint halo of gaseous material, about 6 light-years across, which surrounds the brighter, familiar planetary nebula.
![Сферическая планетарная туманность Эйбелл 39](https://images.astronet.ru/pubd/2012/10/09/0001270923/abell39_block_960.preview.jpg)
8.10.2012
Ghostly in appearance, Abell 39 is a remarkably simple, spherical nebula about five light-years across. Well within our own Milky Way galaxy, the cosmic sphere is roughly 7,000 light-years distant toward the constellation Hercules.
![Туманность Улитка в телескоп ВИСТА](https://images.astronet.ru/pubd/2012/01/31/0001255773/helix_vista_960.preview.jpg)
31.01.2012
Will our Sun look like this one day? The Helix Nebula is one of brightest and closest examples of a planetary nebula, a gas cloud created at the end of the life of a Sun-like star.
![NGC 6751: туманность Сияющий глаз](https://images.astronet.ru/pubd/2013/03/13/0001282341/ngc6751_hst_960.preview.jpg)
13.03.2013
Planetary nebulae can look simple, round, and planet-like in small telescopes. But images from the orbiting Hubble Space Telescope have become well known for showing these fluorescent gas shrouds of dying Sun-like stars to possess a staggering variety of detailed symmetries and shapes.
![NGC 5189: планетарная туманность с необычно сложной структурой](https://images.astronet.ru/pubd/2012/12/20/0001275146/ngc5189_hst_960.preview.jpg)
19.12.2012
Why is this nebula so complex? When a star like our Sun is dying, it will cast off its outer layers, usually into a simple overall shape. Sometimes this shape is a sphere, sometimes a double lobe, and sometimes a ring or a helix.
![M57: туманность Кольцо](https://images.astronet.ru/pubd/2012/04/20/0001263725/M57-HST-Subaru-Sxgendler.preview.jpg)
20.04.2012
Except for the rings of Saturn, the Ring Nebula (M57) is probably the most famous celestial band. Its classic appearance is understood to be due to perspective - our view from planet Earth looks down the center of a roughly barrel-shaped cloud of glowing gas.
![Звёздные скопления M46 и M47: молодость и старость](https://images.astronet.ru/pubd/2012/04/03/0001263083/m46m47_equivar_960.preview.jpg)
3.04.2012
Many stars form in clusters. Galactic or open star clusters are relatively young swarms of bright stars born together near the plane of our Milky Way Galaxy. Separated by about a degree...
![MyCn18: туманность Песочные часы](https://images.astronet.ru/pubd/2011/08/07/0001253184/mycn18_hst_900.preview.jpg)
7.08.2011
The sands of time are running out for the central star of this hourglass-shaped planetary nebula. With its nuclear fuel exhausted, this brief, spectacular, closing phase of a Sun-like star's life occurs as its outer layers are ejected - its core becoming a cooling, fading white dwarf.
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