Free lessons and tutorials on everything from one-dimensional motion to cosmology.

Free online college-level physics courses from the Massachusetts Institute of Technology.

News from the National Science Foundation relating to physics.

Science section of the New York Times national newspaper.

News & press releases related to physics and the natural sciences from around the world.

Answering your hypothetical questions with physics, every Tuesday.

Latest news from the National Aeronautics and Space Administration.

The American Physical Society (www.aps.org) is a non-profit membership organization working to advance and diffuse the knowledge of physics through its outstanding research journals, scientific meetings, and education, outreach, advocacy and international activities. APS represents over 50,000 members, including physicists in academia, national laboratories and industry in the United States and throughout the world.

The American Institute of Physics (AIP) is a 501(c)(3) not-for-profit membership corporation created for the purpose of promoting the advancement and diffusion of the knowledge of physics and its application to human welfare. It is the mission of the Institute to serve the sciences of physics and astronomy by serving its Member Societies, individual scientists, students and the general public. As a "society of societies," AIP supports ten Member Societies, who collectively represent a broad cross-section of more than 135,000 scientists, engineers, and educators in the global physical science community.

The American Astronomical Society (AAS) is the major organization of professional astronomers in North America. The mission of the American Astronomical Society is to enhance and share humanity's scientific understanding of the universe.

The premier international scientific society in acoustics, dedicated to increasing and diffusing the knowledge of acoustics and its practical applications.

Quick access to a variety of physical reference data as provided by the National Institute of Standards and Technology.

Created by the Institute of Physics, a portal to a wide array of web-based physics resources.

The Newton Project is a non-profit organization dedicated to publishing in full an online edition of all of Sir Isaac Newton’s (1642–1727) writings — whether they were printed or not. The edition presents a full (diplomatic) rendition of all the amendments Newton made to his own texts, but also offers more readable (normalized) version. We will also make available translations of his most important religious and scientific texts.

Videos, images, podcasts, and other multimedia from NASA.