Sloan Digital Sky Survey
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DR16 Projects
     - Hubble Diagram
     - Color
     - Spectral Types
     - H-R Diagram
     - Galaxies
     - Sky Surveys
     - Quasars
 Research Challenges
 For Kids
 User Activities
 Games and Contests
 Links to Others

Advanced Projects

Click on a project name or image to select a project.

Hubble Diagram

Retrace the steps of astronomers like Edwin Hubble in the 1920s, as they slowly began to realize we live in an expanding universe.


Look up at the sky - what do you see? If you're near a city, you may see a few bright white stars. But you're not really seeing the full story of the sky - stars come in a dazzling array of colors, from bright blue to white to deep red. In this project, you'll see stars of all colors, and you'll learn what causes the color of a star.

Spectral Types

How do astronomers make sense of the millions of stars they see? In this project, you will learn by classifying the stars yourself.

Hertzsprung-Russell Diagram

Learn how astronomers study the lives and times of stars, which live for millions or billions of years.


How do astronomers study galaxies, which can be millions or billions of light-years away - so far away that most just look like fuzzy patches of light? In the Galaxies project, you will learn by examining galaxies yourself.

Sky Surveys

Learn about how astronomers map the sky, from ancient times to today's cutting edge technology.


Learn about quasars, the most distant and mysterious objects in the universe.