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Summary
Description |
English: An enormous but extremely faint halo of gaseous material surrounds the Cat's Eye Nebula and is over three light-years across. Within the past years some planetary nebulae been found to have halos like this one, likely formed of material ejected during earlier active episodes in the star's evolution - most likely some 50,000 to 90,000 years ago.
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Date |
9 September 2004 |
Source |
http://www.spacetelescope.org/images/heic0414b/ |
Author |
Nordic Optical Telescope and Romano Corradi |
Permission ( Reusing this file) |
http://www.spacetelescope.org/copyright/
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This file is licensed under the Creative Commons Attribution 1.0 Generic license. |
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- to remix – to adapt the work
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- attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
http://creativecommons.org/licenses/by/1.0 CC-BY-1.0 Creative Commons Attribution 1.0 truetrue
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Licensing
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This file is licensed under the Creative Commons Attribution 3.0 Unported license. |
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- 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 attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
http://creativecommons.org/licenses/by/3.0 CC-BY-3.0 Creative Commons Attribution 3.0 truetrue
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File usage
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