NASA
Nasa: The Space Place: How Old Do I Look?
Find out how the Galex space telescope is determining the age of galaxies using red-shifted light. View pictures taken by Galex. This resource also has a game which involves determining the ages of objects.
NASA
Nasa: The Space Place: Keck Interferometer
This site from the National Aeronautics and Space Administration provides the opportunity to solve a crossword and learn about the world's biggest telescopes.
