Plik:Caldwell 47.jpg
![Plik:Caldwell 47.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Caldwell_47.jpg/599px-Caldwell_47.jpg)
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OpisCaldwell 47.jpg |
English: This Hubble image of Caldwell 47 shows a gleaming globular cluster in all of its glory. Star clusters like this one encircle our galaxy like bees buzzing around a hive. Sparsely packed open clusters are often strewn throughout the disk of the galaxy — a relatively flat area that includes most of the galaxy’s contents, including the spiral arms. Globular clusters, however, are typically found in the galaxy’s halo — a diffuse, spherical area that surrounds the heart of the galaxy.
Caldwell 47 is about 50,000 light-years away from Earth, but the combined light of its many thousands of stars calls our attention from halfway across the galaxy. Hubble imaged the cluster here in visible and infrared light, which combines the type of light that we can see (visible) with a kind that can peer through clouds of dust (infrared). Hubble’s observations presented astronomers the opportunity to study some of Caldwell 47’s strangest stellar members — blue stragglers. Blue straggler stars are so named because they seem to lag behind in the aging process, appearing younger than the rest of the stars they formed with. Astronomers think that blue stragglers might emerge from binary systems — pairs of stars that orbit each other. One possible scenario is when the more massive star of the pair evolves and expands, the smaller star steals material away from its companion. This stirs up hydrogen fuel and causes the growing star to undergo nuclear fusion at a faster rate. It burns hotter and bluer, like a massive young star. Caldwell 47 was first spied by British astronomer William Herschel in 1785, though he originally thought it was a nebula. Also cataloged as NGC 6934, it is found in the Delphinus constellation and is best viewed in summer night skies in the Northern Hemisphere, or winter skies in the Southern Hemisphere. With a magnitude of 8.8, the cluster can be seen in binoculars, but it will likely appear to be a single star. Through a moderate or large telescope, individual stars can be picked out at the edges of the cluster, with the central region remaining an unresolved haze of stars. For more information about Hubble’s observations of Caldwell 47, see: www.spacetelescope.org/images/potw1023a/ Credit: ESA/Hubble & NASA For Hubble's Caldwell catalog site and information on how to find these objects in the night sky, visit: www.nasa.gov/content/goddard/hubble-s-caldwell-catalog |
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Źródło | https://www.flickr.com/photos/144614754@N02/49201277627/ |
Autor | NASA Hubble |
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Ten plik, opublikowany pierwotnie w serwisie Flickr przez NASA Hubble pod adresem https://flickr.com/photos/144614754@N02/49201277627 (kopia archiwalna), został sprawdzony 23 lutego 2020 przez FlickreviewR 2, który potwierdził, że jest on tam dostępny na licencji cc-by-2.0. |
23 lutego 2020
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27 wrz 2010
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aktualny | 22:03, 23 lut 2020 | ![]() | 4001 × 4002 (14,22 MB) | Killarnee | User created page with UploadWizard |
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Data i czas utworzenia oryginału | 10:00, 27 wrz 2010 |
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Krótki tytuł | A Distant backwater of the Milky Way |
Dostawca | ESA/Hubble & NASA |
Źródło | ESA/Hubble |
Tytuł lub opis obrazu | This bright spray of stars in the small but evocative constellation of Delphinus (the Dolphin) is the globular cluster NGC 6934. Globular clusters are large balls of (typically) a few hundred thousand ancient stars that exist on the edges of galaxies. Lying 50 000 light-years from Earth, in the outer reaches of our Milky Way galaxy, NGC 6934 is home to some of the most distant stars still to be part of our galactic system — in a sense, it is a far-flung suburb to the Milky Way’s city centre. NGC 6934 was first seen by William Herschel in the late eighteenth century. He classified it as a “bright nebula” and was not able to resolve it into stars. The cluster is not bright enough to see with the naked eye, and even in ideal conditions it is very difficult to view with binoculars. However, it is a popular target for amateur astronomers as it can easily be observed using relatively inexpensive telescopes. Broadcaster Patrick Moore, presenter of BBC TV’s The Sky at Night for more than 50 years, included this cluster in his “Caldwell catalogue” of celestial objects that amateur astronomers should look out for.NGC 6934’s faintness is down to its distance — not how bright it really is. With its many thousands of stars, the cluster is no minnow. The fact that the huge core of our galaxy dwarfs it, along with the other 150 or so globular clusters that orbit the Milky Way’s galactic centre, is a reminder of the breathtaking scale of the cosmos.This picture was taken with the Wide Field Channel of the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys. It was created from images taken through filters F814W (near infrared) and F606W (orange), coloured red and blue respectively. The exposure times were 29 minutes per filter, and the field of view is 3.3 arcminutes across. |
Wydawca | ESA/Hubble |
Warunki wykorzystania |
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Komentarz pliku JPEG | This bright spray of stars in the small but evocative constellation of Delphinus (the Dolphin) is the globular cluster NGC 6934. Globular clusters are large balls of (typically) a few hundred thousand ancient stars that exist on the edges of galaxies. Lying 50 000 light-years from Earth, in the outer reaches of our Milky Way galaxy, NGC 6934 is home to some of the most distant stars still to be part of our galactic system — in a sense, it is a far-flung suburb to the Milky Way’s city centre. NGC 6934 was first seen by William Herschel in the late eighteenth century. He classified it as a “bright nebula” and was not able to resolve it into stars. The cluster is not bright enough to see with the naked eye, and even in ideal conditions it is very difficult to view with binoculars. However, it is a popular target for amateur astronomers as it can easily be observed using relatively inexpensive telescopes. Broadcaster Patrick Moore, presenter of BBC TV’s The Sky at Night for more than 50 years, included this cluster in his “Caldwell catalogue” of celestial objects that amateur astronomers should look out for.NGC 6934’s faintness is down to its distance — not how bright it really is. With its many thousands of stars, the cluster is no minnow. The fact that the huge core of our galaxy dwarfs it, along with the other 150 or so globular clusters that orbit the Milky Way’s galactic centre, is a reminder of the breathtaking scale of the cosmos.This picture was taken with the Wide Field Channel of the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys. It was created from images taken through filters F814W (near infrared) and F606W (orange), coloured red and blue respectively. The exposure times were 29 minutes per filter, and the field of view is 3.3 arcminutes across. |
Orientacja obrazu | normalna |
Rozdzielczość w poziomie | 72 punktów na cal |
Rozdzielczość w pionie | 72 punktów na cal |
Użyte oprogramowanie | Adobe Photoshop CS3 Windows |
Data i czas modyfikacji pliku | 18:26, 16 sie 2010 |
Rozmieszczenie Y i C | Wyśrodkowane |
Wersja standardu Exif | 2.31 |
Data i czas zeskanowania | 18:26, 16 sie 2010 |
Znaczenie składowych |
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Obsługiwana wersja Flashpix | 1 |
Przestrzeń kolorów | Nie skalibrowano |
Wersja IIM | 4 |
Słowa kluczowe | NGC 6934 |
Bitów na próbkę |
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Wysokość | 4002 px |
Szerokość | 4001 px |
Interpretacja fotometryczna | RGB |
Próbek na piksel | 3 |
Kontakt |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Typ utworu | Observation |
Data ostatniej modyfikacji metadanych | 20:26, 16 sie 2010 |