Earth Science - Book 903 - Words to Know

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Across
  1. 3. element that is rare on Earth but found in large quantities in asteroids and meteorites
  2. 7. small, rocky body
  3. 8. star found to have a planet orbiting it
  4. 10. average distance of the sun from Earth
  5. 12. heavy nucleus split into two or more lighter segments
  6. 13. largest asteroid; discovered in 1801
  7. 15. mixture of fine dust and rocky debris produced by meteor impacts on the moon's surface
  8. 20. having orbital periods less than one-fourth of Jupiter's
  9. 23. normal, sun-like star
  10. 25. dimmest star in Alpha Centauri system
  11. 26. second-largest asteroid
  12. 30. group of inner-belt asteroids
  13. 32. third brightest star in the night sky single, heavier nucleus
  14. 33. multi-ring crater on the moon
  15. 37. large impression on Mercury's surface
  16. 38. star surrounded by gas and dust
  17. 39. planets orbiting stars other than our sun
Down
  1. 1. extremely dense, rapidly spinning neutron star
  2. 2. relatively empty regions in the main belt; lighter segments
  3. 4. cool, dark areas on the sun's surface
  4. 5. star found to have a planet orbiting it
  5. 6. site containing remnants of iridium
  6. 9. gas planet formed far from its star that migrated inward
  7. 11. energy released by fission or fusion of nuclei, in the form of heat, light, or other radiation
  8. 14. separate cells of hot gas
  9. 16. having orbital period greater than one-half that of Jupiter
  10. 17. the brightest star in the northern constellation Lyra and fourth brightest in the night sky
  11. 18. having orbital period between one-fourth and one-half of Jupiter's
  12. 19. rotation period of the sun
  13. 21. difference in planet's rotation at equator compared to poles
  14. 22. brightest star in Alpha Centauri system
  15. 24. third asteroid found; discovered in 1804
  16. 27. star closest to the sun
  17. 28. brightest asteroid
  18. 29. asteroid that crashed into the earth 65 million years ago
  19. 31. largest impact basin in the solar system; found on the moon
  20. 34. relatively smooth basins on the moon
  21. 35. combining of two light nuclei to form a single, heavier nucleus
  22. 36. asteroid that crashed into Atlantic Ocean 2 million years ago