Across
- 2. group of stars
- 3. two words; type of star orbited by gliese 581c
- 5. phenomenon; wobble of earth’s axis
- 6. discovered moons of jupiter
- 12. two words; lowest limit of temperature
- 13. used to determine chemical composition of stars
- 15. missions to the outer planets (1977-1989)
- 16. aberration. disadvantage of refractors
- 18. two words; thought to accelerate universe expansion
- 20. a principle central to general relativity
- 23. two words; Venus has clouds of this
- 24. the name of our planet
- 25. a book written by isaac newton
- 27. two words; imaginary hollow sphere around the earth
- 30. a moon of mars
- 31. red planet
- 32. smallest planet
- 33. discovered first cepheid variable in 1923
- 34. type of star cluster
Down
- 1. another name for prominences
- 4. part of the sun’s atmosphere
- 7. Europa’s orbit can be described as this
- 8. concept violated by instantaneous action-at-a-distance
- 9. largest crater on the moon
- 10. the arab astronomer al-Sufi revised this person's star catalogue
- 11. two words; constellation between bootes and hercules, asterism of seven stars
- 14. proposed many-worlds interpretation
- 17. a direct method for finding distance to a star
- 19. lets us calculate how fast an object is receding
- 21. Dutch inventor of the telescope
- 22. the U in GUTs; string theory is one of these
- 26. layer of the sun from which light is emitted into space
- 28. two words; local cluster of galaxies containing the milky way
- 29. splits light into a spectrum
- 35. type of particle including electron and muon