The net advance of physics, del MIT
Particle Data Group
The Astrobiology Web
Stanford Linear Accelerator (Stanford)
C.E.R.N., European Laboratory for Particle Physics
I.C.T.P.,The Abdus Salam International Centre for Theoretical Physics, Trieste
U.S.R.A,The Universities Space Research Association
Laboratorio de Física del NIST (National Institute of Standards and Technology)
Hubble Space Telescope Science Institute
The SETI Institute
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT – España)
Learning Development Institute