By Sariaya Phillips

Are all galaxies alike in the universe? *I investigated this question based upon the color variations of stars in galaxies. My new question became: Are all the galaxies in our sample the same color? Research Question

Methods used to figuring out the answer - I used the SDSS sky server website and collected data about galaxies in space. Specific information that needed to be found consisted of the following: (RA, DEC), petraRad_r, modelMag_r, Z by spectra, Z error, Classification type, the U and R, and the U-R calculations. I spilt up the U-R measurements into bins of 0.2 and counted the galaxies in each of the bins, making a histogram of the data collected. Methodology

*If the U-R number is higher then 2.2 the galaxy is redder and if the number is lower then 2.2 then it is bluer. *2.2 is the dividing line in galaxy color between red and blue. Data

I found out that not all the galaxy colors are the same in the class sample of 269. I also found out that there were more red galaxies than blue. Analysis

In conclusion based upon the data collected not all galaxies are the same in the universe. Each galaxy contains different colors of stars. Some have a lot more red and less blue, 169 red galaxies compared to 105 blue galaxies to be exact from the class sample. There are more red galaxies/stars, because they are cooler which means they live longer. This is like a marathon runner versus a sprinter. A sprinter is similar to a blue star and a distance runner is similar to a red star. A sprinter burns energy faster like a blue star and the distance runner goes through the energy slower such as a red star. As a result, because blue stars die faster you are left with more red stars so the galaxy looks more red. Conclusion