A detailed discussion of the nature of light, how it can travel through a vacuum, and how the speed of light is affected when light travels through a medium.

A historical approach to special relativity, giving all the events and names in the history of discovery of special relativity. Many links to these individuals.

A somewhat labored but thorough explanation of general relativity, beginning with Aristotle. Many links to the personalities connected to the article.

An indexing page for Chapter 27 (Origins of the Quantum Theory) of the companion web site for McGraw Hill's Contemporary College Physics textbook. Includes several worthy pages with chapter notes, simple definitions, online computer...

This article discusses the historical figures who contributed to our understanding of the nature of light, x-rays, Quantum ElectroDynamic (QED) theory, and so on.

[Free Registration/Login Required] Watch a clock slow down in the strong gravitational field near the event horizon of a massive black hole. A PDF worksheet and a video tutorial are also available. [2:57]

[Free Registration/Login may be required to access all resource tools.] Students will understand the photoelectric effect and that light has both particle and wave properties. Includes a simulation for exploring the photoelectric effect.

Learn about gravitational waves, what causes them, and how they are detected.

Describes the design of the first nuclear reactor by Enrico Fermi and his successful development of a self-ustaining nuclear chain reaction. Describes the evolution of the Manhattan Project and their race to develop the first atomic...

[Free Registration/Login may be required to access all resource tools.] Explores the evolution of science, major contributions in the history of science, and the scientific revolution.

Instructions that take you through an Einstein-like thought experiment by having you imagine and record what you see when stationary and when moving at the speed of light.

Discusses the interaction between light energy and atoms of matter. Explains Einstein's photoelectric effect and discusses its application to lasers. Includes an interactive Java applet depicting the interaction between a photon and an...

Understand what relativity is and what Albert Einstein discovered while studying it. Identify special relativity and general relativity.

The BBC reveals what is known about wormholes, a possible consequence of Einstein's Theory of General Relativity in which space is bent, opening up the possibility of time travel.

This site contains links to biographies of famous scientists and inventors such as Albert Einstein, Isaac Newton, Galileo, and Marie Curie. Learn how these men and women made discoveries that changed the world forever.

Need some ideas for Pi Day on March 14th? You can get some great resources at this location. There are all kinds of links available.

Read excerpts from the writings and speeches of a number of individuals who have left their mark on history. Understand the take-away lessons from these influential leaders.

A fantastic resource where you can find biographies of historical figures. You can search by the person's name or by topics, such as Presidents, United States Leaders, Scientists, Inventors, Humanitarians, Explorers and Pioneers,...

Read brief biographies of astronomers who are grouped by time period.

Explore the story of the principle of relativity. Find practice problems after reviewing the article.

It is sometimes assumed that scientists do not believe in God but these famous scientists actually did. Read details about their lives and beliefs, and some quotes attributed to them.

Describes the history of the invention of the atomic bomb, its use in World War II against Japan, the impact on people who were targetted by it, the immediate and long-term impact on generations of people, the effect on communications,...

Read about the Manhattan Project, the United States' attempt to create an atomic bomb before the scientists in Nazi Germany were able to.

This site from SkyServer provides the history of astronomy as well as links to mapping the sky, galaxies, cosmic structures and much more. Several pictures are given, and the article is medium in length.