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Keywords: planetary nebula, supernova remnant
![NGC 2440: Оболочка нового белого карлика](https://images.astronet.ru/pubd/2001/03/15/0001166685/ngc2440_hst3_big.preview.jpg)
30.07.2000
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!
![NGC 2440: кокон нового белого карлика](https://images.astronet.ru/pubd/2001/10/02/0001170990/ngc2440_hst4.preview.jpg)
5.08.2001
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!
![M2-9: крылья Бабочки](https://images.astronet.ru/pubd/2003/08/18/0001192457/m2-9_hst.preview.jpg)
23.12.1997
Are stars better appreciated for their art after they die? Actually, stars usually create their most artistic displays as they die. In the case of low-mass stars like our Sun and M2-9 pictured above, the stars transform themselves from normal stars to white dwarfs by casting off their outer gaseous envelopes.
![NGC 5307: симметричная планетарная туманность](https://images.astronet.ru/pubd/2003/08/18/0001192465/ngc5307_hst_big.preview.jpg)
31.12.1997
Some stellar nebulae are strangely symmetric. For example, every major blob of gas visible on the upper left of NGC 5307 appears to have a counterpart on the lower right. This picture taken by the Hubble Space Telescope was released last week. NGC 5307 is an example of a planetary nebula with a spiral shape.
![Гамбургер Гомеша: протопланетарная туманность](https://images.astronet.ru/pubd/2002/08/07/0001178819/hamburger_hst.preview.jpg)
7.08.2002
What, in heaven, is that? Sometimes astronomers see things on the sky they don't immediately understand. In 1985 this happened to Arturo Gomez, and the object became known as Gomez's Hamburger for its distinctive yet familiar shape.
![MyCn18: туманность в форме песочных часов](https://images.astronet.ru/pubd/2002/06/15/0001177356/MyCn18_hst.preview.jpg)
15.06.2002
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.
![NGC 2440: кокон нового белого карлика](https://images.astronet.ru/pubd/2003/09/08/0001192824/ngc2440_hst2_big.preview.jpg)
26.04.1998
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!
![Возникновение туманности Тухлое Яйцо](https://images.astronet.ru/pubd/2004/10/09/0001199950/rottenegg2_hst.preview.jpg)
3.09.2001
Fast expanding gas clouds mark the end for a central star in the Rotten Egg Nebula. The once-normal star has run out of nuclear fuel, causing the central regions to contract into a white dwarf. Some of the liberated energy causes the outer envelope of the star to expand.
![Парад планетарных туманностей](https://images.astronet.ru/pubd/2003/06/14/0001190906/pn_block.preview.gif)
14.06.2003
What do the Owl, the Cat's Eye, the Ghost of Jupiter, and Saturn have in common? They're all planetary nebulae of course, glowing gaseous shrouds shed by dying sun-like stars as they run out of nuclear fuel.
![Парад планетарных туманностей](https://images.astronet.ru/pubd/2004/10/09/0001199914/pn_block.preview.gif)
3.10.2001
What do the Owl, the Cat's Eye, the Ghost of Jupiter, and Saturn have in common? They're all planetary nebulae of course(!), glowing gaseous shrouds shed by dying sun-like stars as they run out of nuclear fuel.
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