File:Caldwell 90.jpg
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Summary
[edit]DescriptionCaldwell 90.jpg |
English: Despite its eerie appearance, Caldwell 90 seems to be a fairly typical planetary nebula. It was discovered by John Herschel on April Fool’s Day in 1834 and later cataloged as NGC 2867. Ironically, he originally thought he may have discovered a new planet. More people than John Herschel have been fooled by the appearance of these nebulas, which is why the term “planetary nebula” was coined in the first place — they often look like planets when viewed with small telescopes.
Caldwell 90 was formed in the late stages of the evolution of a Sun-like star. After having steadily produced energy for several billion years through the nuclear fusion of hydrogen into helium in its core, the star underwent a series of energy crises when its supply of hydrogen began to run low. Without the outward force previously created by the energy production, gravity took over and caused the star’s core to contract. The extra pressure allowed the star to produce a heavier element — carbon — in its core. The synthesis of carbon generated a lot more energy than the fusion of hydrogen into helium, which helped the star to not only overcome gravity to expand once again but led the star to swell up a hundred-fold to become a red giant. Eventually the red giant’s outer layers of gas were ejected. Meanwhile, the star transformed from a cool giant into a hot, dense star that radiates ultraviolet light and a fast wind of particles that move outward at around 6 million miles per hour. The stellar wind and ultraviolet light interact with the layers of gas that the red giant ejected to create the glowing, spherical shell we see today. This Hubble image was taken in visible and infrared light using the Wide Field and Planetary Camera 2 as part of a survey of planetary nebulas. Caldwell 90 is located about 6,000 light-years away toward the southern constellation Carina and is best viewed in the late summer or early autumn from the Southern Hemisphere, though it can be spotted low in the sky during the late winter or early spring from Northern Hemisphere locations near the equator. It’s so tiny that it will look like a star even in fairly large telescopes, so use high magnification to get the best look. The magnitude-9.7 nebula will resemble a tiny turquoise stone embedded in the night sky. For more information about Hubble’s observations of Caldwell 90, see: www.spacetelescope.org/images/opo9738c11/ Credit: Howard Bond (STScI) and NASA/ESA 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@N02/49214397387/ |
Author | NASA Hubble |
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This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/49214397387 (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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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.
Image title |
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Date and time of data generation | 06:00, 17 December 1997 |
Short title | NGC 2867 |
Credit/Provider | Howard Bond (ST ScI) and NASA/ES |
Source | ESA/Hubble |
Publisher | ESA/Hubble |
Usage terms |
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JPEG file comment | This image is a part of the Hubble Gallery of Planetary Nebulae. |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS6 (Windows) |
File change date and time | 01:28, 17 September 2015 |
Y and C positioning | Centered |
Exif version | 2.31 |
Date and time of digitizing | 17:49, 9 December 2003 |
Meaning of each component |
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Supported Flashpix version | 1 |
Color space | sRGB |
IIM version | 4 |
Keywords |
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Bits per component |
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Height | 755 px |
Width | 754 px |
Pixel composition | RGB |
Number of components | 3 |
Contact information |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Type of media | Observation |
Date metadata was last modified | 03:28, 17 September 2015 |
Unique ID of original document | adobe:docid:photoshop:a591f0f1-2a67-11d8-8281-a580eb5b60aa |
Copyright status | Copyright status not set |