Across
- 5. star wavelengths are longer
- 9. the mass per unit volume
- 10. the energy required to remove it from the atom
- 11. star wavelengths are shorter
- 12. about 90% of stars lie along a band called
- 13. measure of how bright a star appears
- 14. analysis of spectra
- 15. or the spectrums of stars, are absorption spectrums
Down
- 1. are produced when electrons jump from higher energy levels back down to lower energy levels
- 2. the way the star appears in the sky
- 3. used in measuring the distance to nearby stars
- 4. the distance to an imaginary star whose parallaxes is 1 sec of arc
- 6. motion through space with respect to the sun of many kilometers a second
- 7. speed toward or away from us along the line of sight
- 8. the apparent change in a star's position