The Solar System online course is maintained by the Department of Physics & Astronomy at the University of Tennessee. The twenty two chapters cover everything from time and scale in the universe, development of modern...

An algebra-based overview of elementary and pre-telescope astronomy. Topics covered include sundials, seasons, calendars, precession, shape and rotation of Earth, Greek astronomy, the path to heliocentric theory and...

A collection of some 25,000 historical photographs, slides, lithographs, engravings, and other visual materials, focusing on American physicists and astronomers of the twentieth century, but including many scientists in...

The new online exhibit, Explore the Universe, is provided by the Smithsonian National Air and Space Museum. The site "presents the major discoveries that have given us our current scientific view of the universe,...

In this activity students are asked to interpret a graph that represents the sunspot cycle from 1900 to 1990, then they are asked to graph the number of sunspots that occurred from 1995 to 2003 in order to understand...