File:Keck-RD1-ap980324-fairuse.gif

In March 1998 the galaxy RD1 (RD1) with a redshift of 5.34 was the first object found to exceed a redshift of 5, and was at that time the most distant object known.

Astronomy Picture of the Day (March 24, 1998): http://apod.nasa.gov/apod/ap980324.html
Johns Hopkins University (March 12, 1998): Discovery Pushes Back Boundaries of Known Universe

March 1998

Arjun Dey and his team using the W. M. Keck Observatory. Cropped from the original image by Kevin Heider to make RD1 more obvious when viewing a thumbnail.

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Fair use

This image qualifies for fair use in the articles RD1 because:

1. It helps illustrate how little is known about this distant and hard to detect object.
2. Furthermore, the image provides visual identification, something that would be impossible to do purely in a text form.
3. There is no freely available alternative to this unique image since it is not a frequently photographed subject and is beyond the reach of amateur astronomers.
4. The image has been previously published on the NASA site noted and is assumed given its nature to also have appeared in relevant academic journals.
5. Display of the image, will not comprise commercial exploitation of the image as the usage is for non-profit, academic purposes. # Additionally academic interest in the image may in fact be encouraged by its use here, given that its subject is not well known.
6. Displaying this simple image of a poorly known object on a non-profit website (Wikipedia) should cause no financial loss to the copyright holder(s).

Credit: W. M. Keck Observatory and Arjun Dey
Keck Observatory can be contacted at http://keckobservatory.org/contact