Across
- 2. this indicates the temperature of a star
- 5. according to this, the sun and planets formed together
- 7. the brightness as it appears to us
- 8. had the idea that the universe started from a single point a long time ago.
- 9. groups of stars with names from antiquity
- 10. this is the nearest star to the earth
Down
- 1. series of lines are called this
- 3. observed light passing through a prism produced a rainbow
- 4. a rule that correctly describes a natural phenomenon.
- 6. a hypothesis that is supported by the results of experimentation and observation