1. Thought spiral arms don't move
2. Thought spiral arms are formed by motions of stars
3. Thought all stars in a galaxy are in its spiral arms
4. Thought spiral arms sweep stars in towards the center of a galaxy
5. Thought space between spiral arms is empty
6. Thought spiral arms are formed by winding up/rotation
7. Thought spiral galaxies have more spiral arms than they do (about 20)
1. Thought all galaxies are spiral
2. Thought all galaxies are the same in size and shape
3. Thought galaxies do not have well-characterized shapes
4. Thought spiral galaxies are the most common type
5. Thought galaxies have no global structure
6. Thought all galaxies are spherical
1. Thought the galaxies are randomly distributed/galaxies are not grouped together
2. Thought all stars orbit the center of a galaxy at the same rate (same angular velocity)
3. Thought galaxies don't interact with each other
4. Thought galaxies don't move relative to each other
5. Thought galaxies are immediately adjacent to each other
6. Thought galaxies are stationary
7. Thought stars don't orbit the center of the galaxy
8. Thought galaxies are separate universes in other dimensions
1. Thought there are only a few galaxies
2. Thought there is nothing (e.g. gas, dust) between galaxies
3. Thought new planets and stars can't form
4. Thought galaxies all formed at the time of the Big Bang
5. Thought galaxies and universe mean the same thing
6. Thought the centers of galaxies are empty
7. Thought Magellanic Clouds are composed just of space dust
8. Thought galaxies are the biggest grouping in the universe
9. Thought galaxies are held together by the gravitational attraction of just the stars in them
10. Thought galaxies are isolated (no clusters or superclusters)
11. Thought Andromeda galaxy is the only galaxy we are aware of
12. Thought we cannot see other galaxies from Earth
13. Thought galaxies only contain stars and planets
14. Thought galaxies will last forever
15. Thought number of galaxies is smaller than it is (about 1 million)
16. Thought galaxies are surrounded by energy barriers (a la Star Trek)
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