File:Caldwell 38 - 2.jpg
![File:Caldwell 38 - 2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Caldwell_38_-_2.jpg/800px-Caldwell_38_-_2.jpg?20200223200438)
Original file (2,619 × 770 pixels, file size: 1.13 MB, MIME type: image/jpeg)
Captions
Captions
Summary
editDescriptionCaldwell 38 - 2.jpg |
English: Caldwell 38 is nicknamed the Needle galaxy, because in most telescopes it looks as thin and sharp as a pin. It is a spiral galaxy, but because it is seen almost perfectly edge-on, its spiral structure is concealed. This Hubble image, taken with the Wide Field and Planetary Camera 2, provides a detailed look near the galaxy’s core, which is largely obscured by thick ribbons of dust in the spiral arms.
These observations were taken to search for large groupings of old stars, known as globular clusters, in Caldwell 38. Seeing the Needle galaxy edge-on provides an excellent opportunity to explore globular star clusters. While most of a spiral galaxy’s stars lie within a relatively flat plane, globular clusters tend to be sparsely distributed all around the galaxy, surrounding it like a diffuse shell. When seen face-on, a galaxy’s globular clusters easily get lost in the mix; when a galaxy is seen edge-on, however, these clusters stand out. By conducting a survey of globular clusters in several edge-on spiral galaxies, scientists have been able to study how these clusters form and evolve. Their results seem to indicate that globular clusters form with a very low metal content, but then their metallicity grows over time through subsequent mergers with other globular clusters. The Needle galaxy was discovered by astronomer William Herschel in 1785 and is also cataloged as NGC 4565. It is about 40 million light-years away toward the constellation Coma Berenices. The galaxy is best viewed in the spring from the Northern Hemisphere (autumn from the Southern Hemisphere), and with a magnitude of 9.6 it is fairly easy to spot even with a small telescope. With larger telescopes, a prominent dark lane can be seen crossing the galaxy’s core. For more information about Hubble’s observations of Caldwell 38, see: https://www.spacetelescope.org/images/potw1228a/ Credits: NASA, ESA and K. Ashman (University of Missouri); Processing: Gladys Kober (NASA/Catholic University of America) 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@N02/49200142596/ |
Author | NASA Hubble |
Licensing
edit![w:en:Creative Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/CC_some_rights_reserved.svg/90px-CC_some_rights_reserved.svg.png)
![attribution](https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Cc-by_new_white.svg/24px-Cc-by_new_white.svg.png)
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
![]() |
This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/49200142596 (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
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 20:04, 23 February 2020 | ![]() | 2,619 × 770 (1.13 MB) | Killarnee (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on de.wikipedia.org
Metadata
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.
Orientation | Normal |
---|---|
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CC 2018 (Macintosh) |
File change date and time | 14:39, 14 November 2019 |
Y and C positioning | Centered |
Exif version | 2.31 |
Date and time of digitizing | 13:59, 12 November 2019 |
Meaning of each component |
|
Supported Flashpix version | 1 |
Color space | sRGB |
Bits per component |
|
Compression scheme | Uncompressed |
Height | 770 px |
Width | 2,619 px |
Pixel composition | RGB |
Number of components | 3 |
Date metadata was last modified | 09:39, 14 November 2019 |
Unique ID of original document | xmp.did:e945f73e-03c8-4443-b4ac-7af43399622e |