File:Caldwell 22.jpg
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Summary
[edit]DescriptionCaldwell 22.jpg |
English: Caldwell 22, also cataloged as NGC 7662 and nicknamed the Snowball Nebula or Blue Snowball Nebula, is a planetary nebula located about 2,500 light-years from Earth. Nebulas like these represent a stage in evolution that stars like our Sun undergo when they run out of fuel. Stars are nuclear furnaces that spend most of their lives fusing hydrogen into helium. Massive stars have fiery fates, exploding as supernovae, but medium-mass stars like the Sun swell to become red giants as they exhaust their fuel.
The process begins when, after billions of years of nuclear fusion, the star starts to shut down. Gravity (no longer balanced by the outward pressure created by nuclear fusion) compresses the stellar core. The star’s outer layers of gas puff away into space, creating a planetary nebula (so named because these objects often resemble planetary orbs when viewed through a small telescope). At the center lie the remains of the original star’s compressed core, a small white dwarf. One day the Sun will meet a similar fate, but it has enough fuel to last another 6 billion years or so. This image was taken using Hubble’s Wide Field and Planetary Camera 2 in 2000. Astronomers compared this image to earlier Hubble images of Caldwell 22 to study how the nebula expanded and changed. Caldwell 22 was discovered by astronomer William Herschel in 1784. It is located in the constellation Andromeda and has a magnitude of 8.3. The nebula is well placed for observing in autumn night skies from the Northern Hemisphere. In the Southern Hemisphere, look for it low in northern skies in the spring. The nebula can be viewed in telescopes of all sizes, but it might be mistaken for a star at low magnification. Higher magnifications will better distinguish the nebula. A medium-sized telescope shows Caldwell 22 well, but the nebula’s central star will remain hidden from all but the largest telescopes. Credit: NASA, ESA and A. Hajian (University of Waterloo) For more information about Hubble’s observations of Caldwell 22, see: chandra.harvard.edu/photo/2012/pne/ 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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Source | https://www.flickr.com/photos/144614754@N02/49096705147/ |
Author | NASA Hubble |
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This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/49096705147 (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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Author | Chandra X-ray Observatory Center |
Source | Chandra X-ray Observatory |
Credit/Provider | X-ray: NASA/CXC/RIT/J.Kastner et al.; Optical: NASA/STScI |
Headline | This gallery shows four planetary nebulas from the first systematic survey of such objects in the solar neighborhood made with Chandra X-ray Observatory. |
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Date and time of data generation | 10 October 2012 |
Width | 3,600 px |
Height | 3,600 px |
Bits per component |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 150 dpi |
Vertical resolution | 150 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CC (Macintosh) |
File change date and time | 18:52, 17 November 2019 |
Exif version | 2.21 |
Color space | sRGB |
Date and time of digitizing | 10:26, 19 July 2012 |
Date metadata was last modified | 13:52, 17 November 2019 |
Unique ID of original document | xmp.did:01F9A2DDD02068118DBB92611A66016B |
Keywords | NGC 7662 |
Contact information | cxcpub@cfa.harvard.edu
60 Garden St. Cambridge, MA, 02138 USA |
IIM version | 4 |