Name: _________________________________ Date: _____________
There's no need to start worrying about it just yet. But a few billion years from now, the Milky Way is in for a violent shock. Astronomers say our home galaxy is on a collision course with Andromeda, our nearest galactic neighbor. You'll find out more in this Planet Diary activity.
- Go to the Hubble Space Telescope's Cosmic Collision. Select Close Captions On and watch the Introduction. Describe what will happen when the Milky Way and Andromeda collide.
- Click Continue Show to the right of Galaxy Evolution. Watch the video. What did John Herschel notice about the night sky in the mid-1800s?
- What did Edwin Hubble learn about Andromeda a century later?
- What is the "startling conclusion" astronomers reached about how galaxies form?
- Click Continue Show to the right of Collision Dynamics. What force drives galaxies into violent cosmic pile-ups?
- What will likely happen to our solar system when Andromeda and the Milky Way collide?
- Click Continue Show to the left of the Fate of the Milky Way. What will Andromeda look like five billion years from now?
- How will the galaxies look "in the end"?