This National Aeronautics and Space Administration (NASA) website shows two images of Mt. Kilimanjaro taken at two different dates. The text on the page explains how the images were taken and explains that the major...
This site, hosted by Harvard University, contains an introduction to Schlieren Optics that can capture changes in the index of refraction of air. The site provides an explanation of how such systems are set up and...
This site provided by National Aeronautics and Space Administration contains an introduction to X-rays and their uses in medicine and astronomy. Descriptions of the first X-ray observations, how they are used to...
This site from the Exploratorium presents a demonstration showing that the acceleration of gravity is the same for different objects. The site contains a materials list, assembly instructions for creating the vacuum,...
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