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Astrochemistry

Introduction

What is a galaxy?

A galaxy is a huge system consisting of stars, planets, gas, dust, and lots of other interstellar media. The galaxy we live in is called the Milky Way. Galaxies have a lot of stars—the smallest have roughly ten million, while the largest have a hundred trillion! All of the “stuff” in a galaxy orbits around the center of mass of that galaxy.



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