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I recommend replacing the current thumbnail with

Refractor Cincinnati observatory.jpg

It scales very well and, as a monochromatic illustration, is quite clear.
--Gyrobo (talk) 20:02, 7 May 2010 (UTC)

Goldstone DSN antenna.jpg		Image in use since 2006
P200 Dome Open.jpg		Current image

Not all observatories are refractors, and your image is much too large at 40px; It just doesn't play nice with other stub templates. See all the whitespace it creates:

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

Whereas the old picture stacked nicely, so that multiple stub templates can be placed on a page without being very ungainly.

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

The new image "P200 Dome Open.jpg" works at 40px and 30px

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

Your image needs to be at most 15px, where it is too small to be useful.

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

This article is a stub. You can help Wikipedia by expanding it.

and it already looks like a military cannon, even more so when reasonably sized to play nicely when multiple stub templates appear on an article. 70.29.208.247 (talk) 10:02, 15 May 2010 (UTC)

This is being discussed at WT:AST#stub templates. I suggest this discussion continue there. 70.29.208.247 (talk) 10:02, 15 May 2010 (UTC)