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Astrophysics Astroparticle and Particle Physics
Data Bases:

SIMBAD Astronomical Database

ESO Online Digitized Sky Survey

SAO/NASA Astrophysics Data System (with abstract service)

SAO/NASA Astrophysics Data System (ESO mirror)

arXiv.org (Astrophysics e-Print archive)

Canadian Astronomy Data Centre

SkyView Virtual Observatory

Astroparticle Physics Experiments

INSPIRE (formerly SPIRES)

PDG (Particle Data Group)

Organizations:

ESO (European Southern Observatory)

ESA (European Space Agency)

NASA (National Aeronautics and Space Administration)

Space Telescope Science Institute (STScI)

Space Telescope European Coordinating Facility

Astronomische Gesellschaft

American Astronomical Society

SETI Institute

ASPERA (European ASstroParticle ERAnet)

CERN

CTA-Consortium (Cherenkov Telescope Array)

FERMI Education & Public Outreach

H.E.S.S. Collaboration (High Energy Stereoscopic System)

International Particle Physics Outreach Group (IPPOG)

 

Misc.

AstroWeb - astronomy & astrophysics in the WEB

Astronomy Picture of the Day

Heavens-Above - Visibility of satellites etc.

NASA's Planetary Photojournal

The Nine Planets - A Multimedia Tour of the Solar System

International Astronomy Meetings

Astroteilchenphysik.de

FERMI (NASA)

FERMI (Stanford University)

Physics Web

Physlets