• Anglo-Australian Observatory - lots of astronomy images and other astronomy info
• Astronomical Image Galleries - images of mainly galaxies
• Astronomical Image Library - searchable index for astronomy pictures on the web
• Astronomy Picture of the Day - a picture and description (written by a professional astronomer) that changes every day
• Canadian Astronomy Data Centre (CADC) - access to many astronomical archives, surveys, and catalogs
• Earth Observatory - images of the Earth and events on the Earth from space
• Chandra X-ray Observatory Images
• Digitized Sky Survey - Find info on any object in the sky, including coordinates and pictures
• High Energy Astrophysics Mission Images - Links to images from high energy (X-ray, gamma ray, etc.) satellite observatories including: ROSAT, Einstein (HEAO-2), Copernicus (OAO-3), and many others
• Jim's Hubble Telescope Photo Gallery - gallery presentation of some of the best Hubble Images
• Lunar and Planetary Observation and CCD imaging - amazing pictures and animations of the moon, sun, planets, stars...
• Lunar Photo of the Day - photo with description of the moon, changes daily
• Moonglow Observatory - small astronomical observatory run by Fred Bruenjes as a hobby, contains lots of pictures
• Multiwavelength Milky Way - images of the Milky Way in a variety of wavelengths (radio, infrared, optical, x-ray, gamma ray, etc.)
• NASA Multimedia Gallery - a large collection of NASA photos and videos of astronomy, rocketry, space missions, etc...
• NASA's Planetary Photojournal - contains over 800 publicly released images from various Solar System exploration programs
• National Optical Astronomy Observatory (NOAO) Image Gallery
• The Night Sky Live - live images of the night sky above some of the world's premier observatories
• Observational Mishaps - image database of astronomical observations which exhibit problems one might encounter during observing runs (I particularly found the "Romulan Warships" mishap amusing, if not interesting)
• SDSS Pretty Objects
• Sky View Virtual Telescope - view images of celestial objects in a variety of different wavelengths (visual, radio, x-ray, gamma ray, ect...)
• Space Images Archive - an archive of space images, pictures, art...
• Space Audio - sounds from space (very cool!)
• Stellar Scenes - excellent amateur astrophotography out of Japan (English and Japanese Versions)
• University of Alabama Astronomical Image Galleries - galaxies, comets, clusters, etc.

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