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Fayl:NGC 6881 HST.jpg

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NGC_6881_HST.jpg (532 × 532 piksel, fayl hajmi: 129 KB, MIME tipi: image/jpeg)

Ushbu fayl Vikiomborga yuklangan boʻlib, boshqa loyihalarda ham qoʻllanilishi mumkin. Uning tavsif sahifasidan olingan maʼlumot quyida keltirilgan.

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Taʼrif
English: The breathtaking butterfly-like planetary nebula NGC 6881 is visible here in an image taken by the NASA/ESA Hubble Space Telescope. Located in the constellation of Cygnus, it is formed of an inner nebula, estimated to be about one fifth of a light-year across, and symmetrical “wings” that spread out about one light-year from one tip to the other. The symmetry could be due to a binary star at the nebula’s centre.

NGC 6881 has a dying star at its core which is about 60% of the mass of the Sun. It is an example of a quadrupolar planetary nebula, made from two pairs of bipolar lobes pointing in different directions, and consisting of four pairs of flat rings. There are also three rings in the centre.

A planetary nebula is a cloud of ionised gas, emitting light of various colours. It typically forms when a dying star — a red giant — throws off its outer layers, because of pulsations and strong stellar winds.

The star’s exposed hot, luminous core starts emitting ultraviolet radiation, exciting the outer layers of the star, which then become a newly born planetary nebula. At some point, the nebula is bound to dissolve in space, leaving the central star as a white dwarf — the final evolutionary state of stars.

The name “planetary” dates back to the 18th century, when such nebulae were first discovered — and when viewed through small optical telescopes, they looked a lot like giant planets.

Planetary nebulae usually live for a few tens of thousands of years, a short phase in the lifetime of a star.

The image was taken through three filters which isolate the specific wavelength of light emitted by nitrogen (shown in red), hydrogen (shown in green) and oxygen (shown in blue).
Sanasi
Manba http://www.spacetelescope.org/images/potw1211a/
Muallif ESA/Hubble & NASA

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  • atribut – Siz tegishli litsenziyaga havolani taqdim etishingiz va oʻzgartirishlar kiritilganligini koʻrsatishingiz kerak. Siz buni har qanday oqilona yoʻl bilan qilishingiz mumkin, lekin litsenziar Sizni yoki Sizning foydalanishingizni ma'qullashini taklif qiladigan tarzda emas.

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tashkil etilgan

12 mart 2012

Fayl tarixi

Faylning biror paytdagi holatini koʻrish uchun tegishli sana/vaqtga bosingiz.

Sana/VaqtMiniaturaOʻlchamlariFoydalanuvchiIzoh
joriy09:13, 2019-yil 31-dekabr09:13, 2019-yil 31-dekabr dagi versiya uchun tasvir532 × 532 (129 KB)BevinKaconactual size from source
12:18, 2012-yil 12-mart12:18, 2012-yil 12-mart dagi versiya uchun tasvir1 280 × 1 280 (266 KB)Jmencisom

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