1. Which of the following best defines a galaxy?
2. What galaxy do we live in?
3. Our galaxy is a part of what galaxy cluster?
4. What type of galaxy is formed by a massive grouping of stars in the shape of a disc?
5. What type of galaxy is often formed when two other types of galaxies crash into each other?
6. What type of galaxy is the Milky Way?
7. What type of galaxy has a long bar in the middle with spirals coming off the ends?
8. What do scientists believe exists at the center of galaxies?
9. What galaxy is closest to the Milky Way?
10. Around how long does it take the Sun to orbit our galaxy?