| The Messier Catalog | compiled by Hartmut Frommert |
|---|---|
| The interactive NGC Catalogue | compiled by Hartmut Frommert |
| The Web Nebulae | compiled by Bill Arnett |
| Astronomy Picture of the Day | compiled by R. Nemiroff und J. Bonnel |
| Astronomy Program | by the University of Alabama |
| Hoher List Images | observed by Martin Altmann |
| Latest HST Images | by NASA |
| Photographs from the Anglo-Australian Observatory | observed by David Malin |
| Atmospheric Optics | compiled by Les Cowley |
| "Pretty Pictures" Links |