Research Challenge. Think of a question you would like to answer by
studying the colors of objects in the SDSS database. You may use one of the questions
below or think of your own.
How do the colors of the hottest stars vary? Of the coolest?
Can you use a color-color diagram to identify giant or dwarf stars?
How do Population I and Population II stars differ? Can you identify any other
populations of stars from a color-color diagram?
Can you distinguish different types of galaxies based on their colors?
Can you identify quasars in a field of stars using only their colors?
Can you identify different types of quasars based on color?
Once you have identified a question to answer, look at the SDSS database. Find several
(at least 20-30) of the objects you are interested in and record their magnitudes.
Calculate some or all of the object's colors (u-g, g-r, r-i, and/or i-z). Make a color-
color diagram or examine the spectra of the objects (for those that have spectra
available). Make whatever graphs you need to understand your question.
When you have finished your research project, E-mail
us your results. Send us the question you were trying to answer, the
Object ID numbers of the objects you examined, and whatever graphs or charts you used
in your research. We'll look at all the projects we receive, and we'll put the best
of them up on this site! | 
