Produced by the National Aeronautics and Space Administration, this website presents the reader with fundamental information about cataclysmic variables, a binary system with a white dwarf and a normal star. It also...

Our Sun is an ordinary star; however, as our own star, it holds special status for us and is essential to our existence. The Sun's gravity holds the solar system together, and nuclear fusion within the Sun supplies the...

This activity introduces students to the concepts of the redshift of a receding star. Students will learn about the properties of light, the Doppler effect, and also about Hubble's discovery of the expansion of the...

This website allows the user to to create and view simulations that show the evolution of stars on a Hertzsprung-Russell (HR) diagram. The site provides tutorials on: how to use the website, H-R Diagrams, and stellar...

The Space Telescope Science Institute (United States) has created this set of all-sky photograph surveys from the ground based telescopes Palomar and UK Schmidt in several colors. Images from any portion of the sky can...