University and College Departments detailed listing of over 1,600 university and college physics & astronomy departments and programs worldwide.
Institutes and National Labs listing of physics and astronomy institutes and national/international laboratories.
Professional Societies worldwide listing of professional physics and astronomy societies and organizations.
Student Societies listing of physics and astronomy university, college and high-school societies.
Journals links to professional and popular journals.
Publishers links to physics and astronomy books and journals publishers.
Companies links to top high-technology companies that make products for physicists, astronomers, engineers and students.
'As long as men are free to ask what they must; free to say what they think; free to think what they will; freedom can never be lost and science can never regress. '