This website from the University of Washington Department of Astronomy provides introductory astronomy activities on topics such as: fundamentals of astronomy, observing the sky, the sun, stars, stellar evolution, the...

This site discusses the planet Jupiter. Some of the topics discussed include: its interior, surface, and atmosphere, its magnetosphere, its moons and rings, missions, myths, and latest news. Also includes numerous...

This web page, authored and curated by David P. Stern, provides the lecture notes for an overview of Kepler's laws. A section is devoted to each of Kepler's three most prominent theories. It includes historical notes...

This National Aeronautics and Space Administration (NASA) website provides information about the group of short-period comets in the Kuiper Belt. The article compares the sizes and composition of these objects to Earth...

This article explores microbial life in extreme environments associated with salinity, acidity, alkalinity, high temperature, low temperature, radiation, gravity, and pressure. It also introduces the role of...