Across
- 2. if this comes between a star and the Earth, some of the stars light may be absorbed before it reaches the Earth
- 3. what luminosity is measured in
- 5. the closest star to the Sun
- 8. these stars appear to pulsate
- 11. the higher the ___ the more energy is radiated
Down
- 1. cepheid variables can be used as...
- 4. this woman is known for discovering the period - luminosity relationship of Cepheid stars
- 6. a method to determine the distance to stars
- 7. the bigger the ___ the more energy is radiated
- 9. the distance light travels in a year
- 10. observed brightness from Earth