Earth Space EC Crossword

123456789101112131415161718192021222324252627
Across
  1. 3. the First half of the moon phases
  2. 5. _______ Laws, determine the shape of an orbit
  3. 9. object spinning around a central point
  4. 10. A hydrogen fusing with a hydrogen will give you what element?
  5. 11. A downward force that pulls objects toward the center
  6. 12. The center of an atom
  7. 14. The atomic number is equal to the number of _____
  8. 15. the shape of an orbit
  9. 16. Inner planets that are made of rocks or metal
  10. 18. ________ fusion is how stars create energy and light
  11. 20. Helium fused with carbon will give you ______
  12. 21. A technique astronomers use to measure the distance from stars to earth
  13. 22. The number of protons an iron atom has
  14. 24. Dark flat planes of the moon
  15. 27. Substance with atoms that have the SAME number of protons
Down
  1. 1. The ______ Space Station is a laboratory in space
  2. 2. Young stars are mostly ______ and helium
  3. 4. Brightness of stars from Earth
  4. 6. Smaller planets will have ______ gravity than larger planets
  5. 7. Outer planets, gas giants
  6. 8. The hottest stars are what color?
  7. 13. composition of stars is measure with a _____
  8. 17. The coolest stars are what color?
  9. 19. In order for fusion to occur, the temperature must reach ten ___ degrees Celsius
  10. 23. A light year is the distance light travels in a _____
  11. 25. Actual brightness of stars
  12. 26. Model that states the sun as the center of the solar system