e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics operated and funded by Cornell University.

From the American Institute of Physics this site works to preserve and make known the historical record of modern physics and allied sciences

is an open access site with a virtual depot of constants, conversion factors, and mathematical equations. Includes an interactive periodic table.

Nation's online library for education and research in Science, Technology, Engineering, Mathematics.

Some of the most spectacular photos on the site are taken by the Hubble Space Telescope. They include images of galaxies far beyond ours, the aftermath of a massive star's death, the world's first view of the Earth from the moon, "Earthrise" from Apollo 8, the first groups of astronauts, including the original Mercury Seven astronauts.

Provides fun, free, interactive, research-based science and mathematics simulations.

From the National Institute of Standards and Technology to support United States industry by providing measurement services and research for electronic, optical and radiation technologies.

Physics news, jobs and resources.

Comprehensive physics and astronomy online education, research, and reference web site.

includes physics, earth science, medicine, nanotechnology, electronics, space, biology, chemistry, computer sciences, engineering, mathematics and other sciences and technologies in a news format.

Searches over 38 databases and 1,950 selected websites, offering 200 million pages of authoritative U.S. government science information, including research and development results.

From the U.S. Dept. of Energy, covering 3 frontiers of scientific discovery: energy, intensity, and cosmic.

Interactive tour of quarks, neutrinos, antimatter, extra dimensions, dark matter, accelerators and particle detectors.

An international collaboration that reviews Particle Physics and related areas of Astrophysics, and compiles/analyzes data on particle properties.

"Enhancing the understanding and appreciation of physics through teaching."

Provides activities, information, and curriculum for educators and students.

Advisors to the nation on science, engineering and medicine.

NSDL was created by the National Science Foundation to provide organized access to high quality resources and tools that support innovations in teaching and learning at all levels of science, technology, engineering, and mathematics (STEM) education.

Educators can use the PSRC to find curriculum materials for all grade levels, classroom demonstrations, labs, online learning material, evaluation instruments, and articles about approaches to science education.

Includes news and resources for OSA "Advancing the science and technology of light."

Including buyer's guide, research news and analysis, and employment opportunities.

Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

An overview of the history, mythology, and current scientific knowledge of each of the planets and moons in our solar system. Each page has text and images, some have sounds and movies, most provide references to additional related information.