- Google Sky
www.google.com/sky
- Deep-Sky.Org
Provides information and images, including a complete Messier object reference, telescope articles, and deep sky links.
www.deep-sky.org
- SEDS Deep Sky Collections and Catalogs
Provides a number of historically important deep sky catalogs and lists.
seds.lpl.arizona.edu/messier/xtra/similar/catalogs.html
- Virtual Sky
Portal to multiple representations of the night sky, including a high-resolution optical survey of the Northern sky and the Uranometria engravings from 1603.
www.virtualsky.org
- Deep Sky Database
Online observing list generator for amateur astronomers who love to pursue deep sky objects.
www.virtualcolony.com/sac
- Hubble Deep Field
The Hubble Deep Field captures a sliver of the early universe before our sun was even born, back to when galaxies began to form.
hubblesite.org/discoveries/hubble_deep_field
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