Astronomy Picture of the Day
HEASARC Picture of the Week
NASA High Energy Astrophysics Science Archive Research Center (HEASARC)
Space Telescope Science Institute (STScI)
Infrared Processing and Analysis Center (IPAC)
National Radio Astronomy Observatory (NRAO)

2. Electronic Literature

Astrobites
Astrophysics Preprint Archive (astro-ph)
NASA Astrophysics Data System (ADS)
The Astronomer's Telegram (ATel)
Columbia's E-Journals
Scientific American
Science
Nature
Annual Review of Astronomy and Astrophysics

3. Technical Resources

SkyView (The Internet's Virtual Telescope)
SIMBAD Astronomical Database
Zombeck's Handbook of Space Astronomy and Astrophysics
NIST Atomic Spectra Database

4. Miscellaneous

Columbia Astronomy Tools Page

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