File:Geminga-1.jpg

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Summary[edit | edit source]

Geminga is a very weak neutron star and the pulsar next to us, which almost only emits extremely hard gamma-rays, but no radio waves.

The supernova explosion 300 000 years ago, which left behind Geminga, could be responsible for the existence of the Local Bubble. Some thousand years ago our Sun entered this several hundred light-years big area, which is nearly dust-free.

Licensing[edit | edit source]

Description	This image of Geminga is taken by XMM Newton in X-rays.
Source	The image occurs on a website which states, "On this site the Creative Commons Attribution 3.0 Unported license is used. The rights owners of the images are given in the image caption." url=http://jumk.de/astronomie/special-stars/geminga.shtml. The article is entitled, "Geminga".
Date	June 27, 2006.
Author	P.A. Caraveo (INAF/IASF), Milan and ESA.
Rationale	No free use or Public Domain image known to show this image of Geminga taken by XMM Newton in X-rays.
Permission	Fair use claimed, on Wikipedia is stated: "The source's conditions of use state that the image is publicly released for educational and informational purposes."

This work is copyrighted. The individual who uploaded this work and first used it in an article, as well as subsequent persons who place it into articles, asserts that this qualifies as fair use of the material under United States copyright law.

This template must be accompanied by a {{Non-free media rationale}} justifying the assertion of fair use.

Note: The kinds of things that are considered acceptable for fair use on Wikiversity is significantly less than what is legally permitted. Please consult the Wikimedia Foundation Fair Use Policy to see if this content is permitted on Wikiversity under these further restrictions. Familiarize yourself with the Wikiversity Exemption Doctrine Policy before using this template.

The image is non-free fair use in Gamma-ray astronomy.

Fair use for Gamma-ray astronomy[edit | edit source]

To illustrate the subject in question, its detection and effect, since no picture can be obtained of the high-energy gamma-ray radiation itself.

The image linked here is claimed to be used under fair use as:

it is a scientifically significant image of a gamma-ray/X-ray astronomy phenomenon;
it is of much lower resolution than the original (copies made from it will be of very inferior quality)
the photo is only being used for informational/educational purposes.
Its inclusion in the article adds significantly to the article because it shows the phenomenon depicted in this article and how it has a significant impact on gamma-ray astronomy to the general public.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:55, 8 May 2013		350 × 308 (28 KB)	Marshallsumter (discuss \| contribs)	Geminga is a very weak neutron star and the pulsar next to us, which almost only emits extremely hard gamma-rays, but no radio waves. The supernova explosion 300 000 years ago, which left behind Geminga, could be responsible for the existence of the L...

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