Fasciculus:A pulsating stellar relic.jpg

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Sua resolutio ‎(1 280 × 1 305 elementa imaginalia, magnitudo fasciculi: 275 chiliocteti, typus MIME: image/jpeg)

Hic fasciculus apud Vicimedia Communia iacet; in aliis inceptis adhiberi potest. Contenta paginae descriptionis fasciculi subter monstrantur.

Summarium

Descriptio
English: This NASA/ESA Hubble Space Telescope image shows the planetary nebula NGC 2452, located in the southern constellation of Puppis. The blue haze across the frame is what remains of a star like our Sun after it has depleted all its fuel. When this happens, the core of the star becomes unstable and releases huge numbers of incredibly energetic particles that blow the star's atmosphere away into space.

At the centre of this blue cloud lies what remains of the nebula's progenitor star. This cool, dim, and extremely dense star is actually a pulsating white dwarf, meaning that its brightness varies over time as gravity causes waves that pulse throughout the small star's body.

NGC 2452 was discovered by Sir John Herschel in 1847. He initially defined it as "an object whose nature I cannot make out. It is certainly not a star, nor a close double star [...] I should call it an oblong planetary nebula". To early observers like Herschel with their smaller telescopes, planetary nebulae resembled gaseous planets, and so were named accordingly. The name has stuck, although modern telescopes like Hubble have made it clear that these objects are not planets at all, but the outer layers of dying stars being thrown off into space.

A version of this image was entered into the Hubble's Hidden Treasures image processing competition by contestants Luca Limatola and Budeanu Cosmin Mirel.
Datum
Fons http://www.spacetelescope.org/images/potw1339a/
Auctor ESA/Hubble & NASA

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This file is licensed under the Creative Commons Attribution 4.0 International license.
Attributio: ESA/Hubble
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30 Septembris 2013

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image/jpeg

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68f41a07f2b9e97fff6dd3355ef9d5bf8fcceecb

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281 918 byte

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Historia fasciculi

Presso die vel tempore fasciculum videbis, sicut tunc temporis apparuit.

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recentissima00:43, 2 Octobris 2013Minutum speculum redactionis 00:43, 2 Octobris 2013 factae1 280 × 1 305 (275 chiliocteti)JmencisomUser created page with UploadWizard

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Hic fasciculus alias res continet, saepius a machina originatore additas, et (si fasciculus postea recensus sit) fortasse corrigendas.

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