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Keywords: supernova, hypernova
![Петля Лебедя](https://images.astronet.ru/pubd/2003/08/09/0001192242/CygnusLoop_hst.preview.gif)
8.08.1998
15,000 years ago a star in the constellation of Cygnus exploded -- the shockwave from this supernova explosion is still expanding into interstellar space! The collision of this fast moving wall of gas with...
![Петля Лебедя](https://images.astronet.ru/pubd/2001/06/24/0001169537/CygnusLoop_hst.preview.jpg)
23.06.2001
The shockwave from a 20,000 year-old supernova in the constellation of Cygnus supernova explosion is still expanding into interstellar space. The collision of this fast moving wall of gas with a stationary cloud...
![Петля Лебедя](https://images.astronet.ru/pubd/2003/08/09/0001192243/CygnusLoop_hst_big.preview.gif)
3.08.1997
15,000 years ago a star in the constellation of Cygnus exploded -- the shockwave from this supernova explosion is still expanding into interstellar space! The collision of this fast moving wall of gas with...
![Петля Лебедя](https://images.astronet.ru/pubd/2006/11/14/0001217819/CygnusLoop_hst_big.preview.gif)
25.07.1999
The shockwave from a 20,000 year-old supernova in the constellation of Cygnus supernova explosion is still expanding into interstellar space. The collision of this fast moving wall of gas with a stationary cloud...
![Близкая сверхновая в M51](https://images.astronet.ru/pubd/2005/07/19/0001207306/m51sn_gabany.preview.jpg)
19.07.2005
One of the nearest supernovas of recent years was discovered late last month in the bright nearby galaxy M51. It is visible on the right of the above before and after images of the picturesque spiral. Can you spot it?
![Sher 25: будущая сверхновая](https://images.astronet.ru/pubd/2001/10/30/0001172184/ngc3603_wb.preview.jpg)
27.10.2001
No supernova has ever been predicted. These dramatic stellar explosions that destroy stars and disperse elements that compose people and planets are not so well understood that astronomers can accurately predict when a star will explode - yet. Perhaps Sher 25 will be the first.
![Сверхновая в 1006 году](https://images.astronet.ru/pubd/2003/03/28/0001188373/sn1006_tezel.preview.jpg)
28.03.2003
A new star, likely the brightest supernova in recorded human history, appeared in planet Earth's sky in the year 1006 AD. The expanding debris cloud from the stellar explosion is still visible to modern astronomers, but what did the supernova look like in 1006?
![Остаток вспышки сверхновой в Парусах в рентгеновских лучах](https://images.astronet.ru/pubd/2003/10/04/0001193635/vela_rosat_big.preview.gif)
12.06.1996
What happens when a star explodes? A huge fireball of hot gas shoots out in all directions. When this gas slams into the existing interstellar medium, it heats up so much it glows in X-rays.
![Ударная волна сверхновой 1987A](https://images.astronet.ru/pubd/2002/02/26/0001174935/sn87aknot_hst.preview.jpg)
23.02.2002
Fifteen years ago today, the brightest supernova of modern times was sighted. Over time, astronomers have watched and waited for the expanding debris from this tremendous stellar explosion to crash into previously expelled material.
![Эхо от сверхновой 1987A](https://images.astronet.ru/pubd/2003/08/17/0001192392/sn87echo_aat.preview.gif)
23.10.1997
Can you find Supernova 1987a? It's not hard - it occurred in the center of the bulls-eye pattern. Although this stellar detonation was seen more than a decade ago, light from it continues to bounce off nearby interstellar dust and be reflected to us. These two rings are thus echoes of the powerful supernova.
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