DR7 Projects
     - Hubble Diagram
     - Color
     - Spectral Types
     - H-R Diagram
     - Galaxies
     - Sky Surveys
     - Quasars
     - Image Processing
 Research Challenges
 For Kids
 User Activities
 Games and Contests
 Links to Others
 Colors of SDSS stars
 Amounts of Light
 What is Color?
 SDSS Filters
 Light from Stars
 Radiation Curves
 Peak Wavelengths
 Color-color Diagrams
 Making a Diagram
 Diagram for SDSS
 Other Objects
 Color in Research
 Your Results


Look up on a clear night, far away from city lights, and you will see thousands of stars. If you look closer, you might notice that the stars shine with an amazing variety of colors. Some glow dull red, some blue, some yellow like the sun, and some bright white. The picture to the right shows three stars - red, blue, and white - as seen by SDSS.

But what exactly is color? Why do stars have different colors? And what can you learn by studying the colors of stars, galaxies, and other objects? Click "Next" to find out.