Lesson 25 - Lecture 2 - Weighing the Galaxy and the Galactic Center - OpenStax
Channel: Introduction to Astronomy
Date: 2019-02-08

In this lecture, we will discuss methods of determining the mass of the galaxy using Kepler's third law and rotation curves. This will show that dark matter must be present in the galaxy. We will also look at the center of our galaxy and the evidence for a supermassive black hole there. These lecture videos are designed to complement the content in the OpenStax Astronomy textbook. The book can be downloaded free of charge at: https://openstax.org/details/books/astronomy/