AS102 Study Guide - Final Guide: Star Formation, Perseus Arm, Spiral Galaxy
Document Summary
We live in arguably the most beautiful of galaxies a spiral galaxy. Later in this module we will learn about the types of galaxies (their classification) but certainly spiral galaxies are one of nature"s most appealing structures. From the study of other spiral galaxies we know that hot, blue stars are found in the spiral arms (along with dust, gas and young stars usually found in clusters. So, looking for the locations of class o and b stars in our own galaxy should tell us something about the structure of our galaxy. Using spectroscopic parallax astronomers have been able to map the locations of o and b stars and have found them in sections of the galaxy that form parts of spiral arms (the perseus arm, the. Any spiral galaxy is a collection of some 100 or 200 billion stars travelling through space at some velocity.
