Other resources

• CERN – European Organization for Nuclear Research
• Institute of Physics (IOP): good source of online physics information; you can search across the whole site using the search screen, or have a look at the index of available resources
• SAO/NASA Astrophysics Data System (ADS): digital Library portal for researchers in Astronomy, Physics and Astrophysics.  It is three bibliographic databases with over 12.2 million records, including the ArXiv e-prints.
• Physicsworld.com: has links to reference sources from the Institute of Physics (IOP)
• Astronomical Data Centre: from the Cambridge Astronomical Survey Unit
  

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Professional organisations and societies

• American Astronomical Society
• American institute of Physics
• American Physical Society
• European Physical Society
• Institute of Physics
• Optical Society of America (OSA)

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PrePrint archives:

• ArXiv-  ArXiv gives access to full text, open access research papers covering physics, mathematics and computer science. It contains articles that have not yet been peer-reviewed / published
• CERN document server – high energy and particle physics information
• InSPIRE -high energy physics literature database
• NASA Technical reports server (NTRS)– aerospace-related citations, full-text online documents, and images and videos created or funded by NASA