Across
- 2. When a light source is moving away from an observer, what color is seen?
- 3. Who noticed that the galaxies were moving away from each other?
- 6. What are groups of stars with names from antiquity?
- 8. Rule that correctly describes a natural phenomenon.
- 10. What about a star indicates its temperature?
Down
- 1. The theory that states the universe was formed from an explosion.
- 4. Small rocky bodies that orbit the sun.
- 5. A huge assemblage of stars, interstellar gas and dust.
- 7. Milky way galaxy and its neighboring galaxies.
- 9. Violet is seen when a light source is moving ____ an observer.