File:Caldwell 30.jpg
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[edit]DescriptionCaldwell 30.jpg |
English: The majestic spiral galaxy Caldwell 30, also cataloged as NGC 7331, is often touted as an analog to our own Milky Way, as its size, shape and mass are similar to our galaxy’s. Caldwell 30’s starry disk is inclined to our line of sight, so long telescopic exposures often result in images that evoke a strong sense of depth. In this Hubble close-up, taken in visible and ultraviolet light using the Wide Field Camera 3, the galaxy’s magnificent spiral arms feature dark, obscuring dust lanes, bright bluish clusters of massive young stars and the telltale reddish glow of active star-forming regions. The bright, yellowish central regions harbor populations of older, cooler stars. As in the Milky Way, a supermassive black hole lies at the core of this near-twin galaxy.
Hubble took this image of Caldwell 30 while studying a supernova explosion, which is the fiery death of a massive star. This supernova, called SN 2014C, experienced an unusual and dramatic transformation that involved a significant upsurge in hydrogen content. Hubble’s observations provided a chance to gain insight into the final stages of massive stars. Caldwell 30 is located about 45 million light-years away at the northern boundary of the constellation Pegasus. The galaxy is only about half a degree away from a group of five galaxies known as Stephan’s Quintet. Caldwell 30 and the quintet may appear to be near each other in the sky, but the quintet is actually about six times farther away from Earth. Caldwell 30 was discovered in 1784 by famed astronomer William Herschel, who also discovered the planet Uranus as well as many other Caldwell objects. Late autumn skies will provide the best view from the Northern Hemisphere (or spring skies in the Southern Hemisphere). However, with a magnitude of 9.5, Caldwell 30 will require a telescope or large binoculars to see it for yourself. In light-polluted skies, only the central core of the galaxy is visible. Under dark skies, a large telescope will also reveal the galaxy’s sweeping spiral arms. For more information about Hubble’s observations of Caldwell 30, see: www.spacetelescope.org/images/potw1805a/ 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 |
Date | |
Source | https://www.flickr.com/photos/144614754@N02/49199402508/ |
Author | NASA Hubble |
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This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/49199402508 (archive). It was reviewed on 23 February 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
23 February 2020
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This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Date and time of data generation | 06:00, 29 January 2018 |
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Short title | Twins with differences |
Credit/Provider | ESA/Hubble & NASA/D. Milisavljev |
Source | ESA/Hubble |
Image title | This NASA/ESA Hubble Space Telescope image shows a spiral galaxy known as NGC 7331. First spotted by the prolific galaxy hunter William Herschel in 1784, NGC 7331 is located about 45 million light-years away in the constellation of Pegasus (The Winged Horse). Facing us partially edge-on, the galaxy showcases it’s beautiful arms which swirl like a whirlpool around its bright central region. Astronomers took this image using Hubble’s Wide Field Camera 3 (WFC3), as they were observing an extraordinary exploding star — a supernova — which can still be faintly seen as a tiny red dot near the galaxy’s central yellow core. Named SN2014C, it rapidly evolved from a supernova containing very little Hydrogen to one that is Hydrogen-rich — in just one year. This rarely observed metamorphosis was luminous at high energies and provides unique insight into the poorly understood final phases of massive stars. NGC 7331 is similar in size, shape, and mass to the Milky Way. It also has a comparable star formation rate, hosts a similar number of stars, has a central supermassive black hole and comparable spiral arms. The primary difference between our galaxies is that NGC 7331 is an unbarred spiral galaxy — it lacks a “bar” of stars, gas and dust cutting through its nucleus, as we see in the Milky Way. Its central bulge also displays a quirky and unusual rotation pattern, spinning in the opposite direction to the galactic disc itself. By studying similar galaxies we hold a scientific mirror up to our own, allowing us to build a better understanding of our galactic environment which we cannot always observe, and of galactic behaviour and evolution as a whole. |
Publisher | ESA/Hubble |
Usage terms |
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JPEG file comment | This NASA/ESA Hubble Space Telescope image shows a spiral galaxy known as NGC 7331. First spotted by the prolific galaxy hunter William Herschel in 1784, NGC 7331 is located about 45 million light-years away in the constellation of Pegasus (The Winged Horse). Facing us partially edge-on, the galaxy showcases it’s beautiful arms which swirl like a whirlpool around its bright central region. Astronomers took this image using Hubble’s Wide Field Camera 3 (WFC3), as they were observing an extraordinary exploding star — a supernova — which can still be faintly seen as a tiny red dot near the galaxy’s central yellow core. Named SN2014C, it rapidly evolved from a supernova containing very little Hydrogen to one that is Hydrogen-rich — in just one year. This rarely observed metamorphosis was luminous at high energies and provides unique insight into the poorly understood final phases of massive stars. NGC 7331 is similar in size, shape, and mass to the Milky Way. It also has a comparable star formation rate, hosts a similar number of stars, has a central supermassive black hole and comparable spiral arms. The primary difference between our galaxies is that NGC 7331 is an unbarred spiral galaxy — it lacks a “bar” of stars, gas and dust cutting through its nucleus, as we see in the Milky Way. Its central bulge also displays a quirky and unusual rotation pattern, spinning in the opposite direction to the galactic disc itself. By studying similar galaxies we hold a scientific mirror up to our own, allowing us to build a better understanding of our galactic environment which we cannot always observe, and of galactic behaviour and evolution as a whole. |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CC 2017 (Windows) |
File change date and time | 09:17, 3 August 2017 |
Y and C positioning | Centered |
Exif version | 2.31 |
Date and time of digitizing | 19:01, 13 January 2017 |
Meaning of each component |
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Supported Flashpix version | 1 |
Color space | Uncalibrated |
IIM version | 4 |
Keywords | NGC 7331 |
Bits per component |
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Height | 3,038 px |
Width | 4,061 px |
Pixel composition | RGB |
Number of components | 3 |
Contact information |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Type of media | Observation |
Date metadata was last modified | 11:17, 3 August 2017 |
Unique ID of original document | xmp.did:d0c3c33e-37d3-9746-95c9-9da07e9d6da2 |