Calendars
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| February 2004 - The Boomerang Nebula | March 2004 - HD 209458b (artist's impression) | April 2004 - The Ghost Head Nebula | May 2004 - The Omega Nebula |
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| June 2004 - The Tadpole galaxy | July 2004 - The Cone Nebula | August 2004 - The Mice | September 2004 - Erupting star V838 Monocerotis |
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| October 2004 - Primeval quasar (artist's impression) | November 2004 - The Horsehead nebula | December 2004 - The Lynx Arc (artist's impression) |