Plik:Caldwell 23 - 2.jpg
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Opis
OpisCaldwell 23 - 2.jpg |
English: If we could travel across space and time to see our own galaxy from the outside looking in, it would probably look a lot like Caldwell 23. This spiral galaxy, also cataloged as NGC 891, is about 35 million light-years away from Earth in the constellation Andromeda. Sir Patrick Moore, creator of the Caldwell catalog, once said the full galaxy looks like “two fried eggs clapped back to back.” In this Hubble image, taken in visible and infrared light using the Advanced Camera for Surveys, the “yolk” portion of the galaxy is out of the picture beyond the lower left corner. A few foreground stars from the Milky Way shine brightly, while more-distant galaxies can be seen in the lower right corner of the image.
Astronomers used Hubble’s observations of Caldwell 23 to learn more about the structure and evolution of spiral galaxies. One of their findings helped identify the source of Caldwell 23’s galactic “halo.” The halo surrounds the galaxy and primarily contains old stars, some of which are grouped together in large, sphere-shaped collections called globular clusters. The source of this halo material has been unclear, since theoretically it could either originate in the galaxy or be gravitationally pulled in from the area surrounding the galaxy. Scientists using Hubble found that Caldwell 23’s halo is similar in composition to other material in the galaxy, which suggests that the halo material was expelled from within the galaxy. This Hubble image shows wispy tendrils of dust and gas branching off from the plane of the galaxy into the halo. Astronomers believe these structures formed as material was ejected outward by supernovae or intense star formation activity. When massive stars light up at birth or explode at death, they produce powerful winds that can blow dust and gas over hundreds of light-years of space. Caldwell 23 was discovered by astronomer William Herschel in October 1784. The galaxy has a magnitude of 10, so use a telescope to see it, away from any sources of light pollution. Under ideal conditions you can make out the galaxy’s central dark lane. Autumn night skies in the Northern Hemisphere will provide the best view. In the Southern Hemisphere, look for Caldwell 23 in the springtime. For more information about Hubble’s observations of Caldwell 23, see: www.spacetelescope.org/images/potw1220a/ hubblesite.org/contents/news-releases/1999/news-1999-10.html Credit: ESA/Hubble & NASA; Acknowledgement: Nick Rose 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 |
Data | |
Źródło | https://www.flickr.com/photos/144614754@N02/49164938063/ |
Autor | NASA Hubble |
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Ten plik, opublikowany pierwotnie w serwisie Flickr przez NASA Hubble pod adresem https://flickr.com/photos/144614754@N02/49164938063 (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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14 maj 2012
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54eeeed4cef4efb2ed9252836977e300e2892538
18 809 716 bajt
3995 piksel
3847 piksel
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Data i czas | Miniatura | Wymiary | Użytkownik | Opis | |
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aktualny | 22:05, 23 lut 2020 | 3847 × 3995 (17,94 MB) | Killarnee | User created page with UploadWizard |
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Data i czas utworzenia oryginału | 10:00, 14 maj 2012 |
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Krótki tytuł | Edge-on beauty |
Dostawca | ESA/Hubble & NASA Acknowledgemen |
Źródło | ESA/Hubble |
Tytuł lub opis obrazu | Visible in the constellation of Andromeda, NGC 891 is located approximately 30 million light-years away from Earth. The NASA/ESA Hubble Space Telescope turned its powerful wide field Advanced Camera for Surveys towards this spiral galaxy and took this close-up of its northern half. The galaxy's central bulge is just out of the image on the bottom left. The galaxy, spanning some 100 000 light-years, is seen exactly edge-on, and reveals its thick plane of dust and interstellar gas. While initially thought to look like our own Milky Way if seen from the side, more detailed surveys revealed the existence of filaments of dust and gas escaping the plane of the galaxy into the halo over hundreds of light-years. They can be clearly seen here against the bright background of the galaxy halo, expanding into space from the disc of the galaxy. Astronomers believe these filaments to be the result of the ejection of material due to supernovae or intense stellar formation activity. By lighting up when they are born, or exploding when they die, stars cause powerful winds that can blow dust and gas over hundreds of light-years in space. A few foreground stars from the Milky Way shine brightly in the image, while distant elliptical galaxies can be seen in the lower right of the image. NGC 891 is part of a small group of galaxies bound together by gravity. A version of this image was entered into the Hubble’s Hidden Treasures Image Processing Competition by contestant Nick Rose. Hidden Treasures is an initiative to invite astronomy enthusiasts to search the Hubble archive for stunning images that have never been seen by the general public. |
Wydawca | ESA/Hubble |
Warunki wykorzystania |
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Komentarz pliku JPEG | Visible in the constellation of Andromeda, NGC 891 is located approximately 30 million light-years away from Earth. The NASA/ESA Hubble Space Telescope turned its powerful wide field Advanced Camera for Surveys towards this spiral galaxy and took this close-up of its northern half. The galaxy's central bulge is just out of the image on the bottom left. The galaxy, spanning some 100 000 light-years, is seen exactly edge-on, and reveals its thick plane of dust and interstellar gas. While initially thought to look like our own Milky Way if seen from the side, more detailed surveys revealed the existence of filaments of dust and gas escaping the plane of the galaxy into the halo over hundreds of light-years. They can be clearly seen here against the bright background of the galaxy halo, expanding into space from the disc of the galaxy. Astronomers believe these filaments to be the result of the ejection of material due to supernovae or intense stellar formation activity. By lighting up when they are born, or exploding when they die, stars cause powerful winds that can blow dust and gas over hundreds of light-years in space. A few foreground stars from the Milky Way shine brightly in the image, while distant elliptical galaxies can be seen in the lower right of the image. NGC 891 is part of a small group of galaxies bound together by gravity. A version of this image was entered into the Hubble’s Hidden Treasures Image Processing Competition by contestant Nick Rose. Hidden Treasures is an initiative to invite astronomy enthusiasts to search the Hubble archive for stunning images that have never been seen by the general public. |
Orientacja obrazu | normalna |
Rozdzielczość w poziomie | 72 punktów na cal |
Rozdzielczość w pionie | 72 punktów na cal |
Użyte oprogramowanie | Adobe Photoshop CS5 Windows |
Data i czas modyfikacji pliku | 16:18, 13 lut 2012 |
Rozmieszczenie Y i C | Wyśrodkowane |
Wersja standardu Exif | 2.31 |
Data i czas zeskanowania | 22:27, 30 sty 2012 |
Znaczenie składowych |
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Obsługiwana wersja Flashpix | 1 |
Przestrzeń kolorów | Nie skalibrowano |
Wersja IIM | 4 |
Słowa kluczowe | NGC 891 |
Bitów na próbkę |
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Wysokość | 3995 px |
Szerokość | 3847 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 | 17:18, 13 lut 2012 |
Unikalny identyfikator oryginalnego dokumentu | uuid:C26DB2EB884BE11180F4ED18AB6954A9 |
Ochrona prawem autorskim | Status praw autorskich nieznany |