164 Module Introduction

“There are at least as many galaxies in our observable Universe as there are stars in our galaxy.”

Martin Rees
Lord Rees of Ludlow
Astronomer
(1942 -)

This module presents an overview of the islands of stars found throughout the Universe: the galaxies. Like many objects we have discovered, galaxies vary in characteristics such as size, shape, and age.

Objectives

Upon completion of this module, the student will be able to:Upon completion of this module, the student will be able to:

  • Define what a galaxy is and the broad characteristics of galaxies, including galaxy types.
  • Explain the history of observing galaxies.
  • Recognize Hubble’s Law and its implications in astronomy.
  • Differentiate among galaxy-related objects, including Quasars, Blazars, galactic grouping, WIMPs, gravitational lensing

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Introduction to Astronomy Copyright © by Lumen Learning is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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