Galilean Moons

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Across
  1. 3. What moon is larger than Mercury?
  2. 4. What way does Europa spin?
  3. 6. What is the third Largest Galilean Moon?
  4. 7. What is Io not likely for life?
  5. 8. What is the surface of Callisto covered with?
  6. 12. What is the third-largest moon in the Solar system?
  7. 13. How many main layers does Ganymede have?
  8. 14. What were the moons originally named?
Down
  1. 1. Who discovered Ganymede?
  2. 2. Which moon has an iron core and rocky mantle?
  3. 5. What makes a lot of heat within Io?
  4. 7. What can Io develop?
  5. 9. What month was Io discovered?
  6. 10. How many years old is Callisto?
  7. 11. How many minutes does it take Europa to reach the sun?
  8. 15. What does Europa's surface contain?