Across
- 2. distance from one wave peak to another
- 3. force of gravity acting between earth and moon, keeping moon in near circular path
- 4. messier 45
- 7. start of solar eclipse
- 9. Tycho's new star?
- 13. star that emits beams of electromagnetic radiation
- 14. a small cool star
- 15. volanic moon of jupiter
- 16. traditional name of bright star in cassiopia (alpha cas)
- 18. ? russell diagram
- 19. increase of radiation wavelength
- 20. star system combining two stars
- 21. shooting star
Down
- 1. sub atomic particle
- 3. regular variable
- 5. measuring the stars
- 6. star exhausted its hydrogen and much bigger than our Sun
- 8. solid resembling a ring doughnut
- 10. either proton or neutron
- 11. small body found between mars and jupiter
- 12. measuring stellar distances
- 17. messier 13 cluster