V and I are different filters through which we can look at objects in the sky. The color data you will be using is referred to as V − I. Is our galaxy just like any other? Are the globular clusters in our galaxy just one color, and, if not, what's the most common cluster color? Based on the colors of the globular clusters, what might we guess about the ages and compositions of the two galaxies? In this project you will use real globular cluster color data and simple statistical analysis to try and answer some of these questions. We can compare the colors of Milky Way clusters to the colors of globular clusters in the M87. The color of a globular cluster gives clues about the cluster's composition (what kinds of elements and stars are in the cluster) and the cluster's age. This project focuses on the colors of globular clusters in our Milky Way and in the galaxy M87. the ways in which galaxies change and evolve.the composition of the early universe (what it was made of),.the location of our sun in the Milky Way,.Here are just some of the quantities that we can measure for globular clusters:Īstronomers have used these properties of globular clusters in our Milky Way and in other galaxies to help determine (among other things): Using modern telescopes and computers, astronomers have studied numerous properties of globular clusters. Since most galaxies contain globular clusters and since globular clusters are so old, the properties of globular clusters can be used to learn about not only the universe today, but also the universe in the past. The average age of globular clusters is somewhere between 10 and 14 billion years, making the clusters some of the oldest objects in the universe. Most globular clusters are found in the large spherical halo of a galaxy. A typical galaxy may contain up to a few hundred globular clusters our galaxy, the Milky Way, has somewhere between 125 and 200 globular clusters orbiting the galactic center. Globular clusters are nearly spherical groups of about 10,000 to 1 million stars.
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