This website discusses the Fermi Paradox, which is about the chances of life beyond Planet Earth. The first part estimates the possibility of existence of other intelligent civilization in our galaxy by solving the Drake...

This activity has students use internet resources to learn about celestial coordinates, and how to use an emphemeris to locate planets on a horizon sky map. The sky maps are then used for outdoor observing. A more...

Authored and curated by David P. Stern, this is a lesson plan for teaching frames of reference. It is linked to text material on reference frames, aberration of light, and a very short introduction to the foundations of...

This web page, created by Edward L. Wright of the University of California, Los Angeles, provides answers to common questions regarding cosmology. Questions include the Universe's age, its origin, its fate, and its...

This site has information regarding the U.S. Army’s requirements for the construction and performance of aircraft power plants, brought to you by GlobalSecurity.org. The basic requirements, including reliability,...