Read this article and answer the questions that follow.
- What type of galaxy is the Milky Way and how big is it?
- According to the article, how is the Milky Way moving through space?
- What is the Milky Way made of?
- What evidence does the article give that the Andromeda Galaxy has collided with other galaxies in the past?
- How do we know the Milky Way is only one of many galaxies and when was this discovered?