Space

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Across
  1. 3. Creation of energy by joining the nuclei of two hydrogen atoms to form an element such as helium.
  2. 4. A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
  3. 7. A force of attraction between objects that is due to their masses.
  4. 9. giants The name given to the first four outer planets: Jupiter, Saturn, Uranus, and Neptune
  5. 10. The spinning of Earth on its axis
  6. 12. The star at the center of our solar system
  7. 16. A ball of frozen dust and rock that orbits the sun and has a tail that glows
  8. 18. (n.) nearness, closeness
  9. 21. a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
  10. 23. shape of an orbit around the another object that can be short or elongated
  11. 24. can form from hydrogen, found in the sun
  12. 25. Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.
  13. 27. nebula a rotating cloud of gas and dust from which the sun and planets formed
  14. 29. Closely packed together
  15. 30. Energy that is radiated or transmitted in the form of rays or waves or particles.
Down
  1. 1. Distance east or west of the prime meridian, measured in degrees (vertical lines on maps)
  2. 2. A model of the universe in which Earth is at the center of the revolving planets and stars.
  3. 5. The movement of an object around another object
  4. 6. The center of mass of two or more bodies orbiting around each other
  5. 8. Distance north or south of the equator (horizontal lines on our maps)
  6. 11. planets The name given to the four inner planets: Mercury, Venus, Earth, and Mars
  7. 13. The direct transfer of heat from one substance to another substance that it is touching.
  8. 14. period The time for one revolution of a planet around the sun. Related to a year.
  9. 15. common element in the sun
  10. 17. referring to the gas giants
  11. 19. A model of the solar system in which Earth and the other planets revolve around the sun
  12. 20. The splitting of an atomic nucleus to release energy.
  13. 22. energy Energy in the form of moving waves of light usually from the sun involved in photosynthesis
  14. 26. sphere the actual shape of the earth
  15. 28. belt the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found