Across
- 4. the interval between two successive occurrences of maximum brightness
- 6. a very large, very bright red giant star
- 7. the brightness of a star when viewed from Earth
- 9. one of two stars revolving around a common center of mass under their mutual gravitational attraction
- 10. how many kilometers away is the sun from earth
- 11. red shifts occur because the light wave frequency is reduced
Down
- 1. a law that states that the galaxies are retreating from the Milky Way at a speed that is proportional to their distance
- 2. the apparent brightness of a star if it were viewed from a distance of 32.6 light-years
- 3. an apparent group of stars originally named for mythical characters
- 5. a large, cool star of hight luminosity; a star occupying the upper right portion of the H-R diagram
- 8. the slight shifting in the apparent position of a nearby star due to the orbital motion of Earth