Honors Earth Science Vocab

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Across
  1. 4. The smaller of the two axes of an ellipse
  2. 6. A unit of astronomical distance equivalent to the distance light travels in one year
  3. 7. a cloud of gas and dust in outer space
  4. 9. Measurement with the sun in the center
  5. 10. a great circle representing the sun's path during the year
  6. 11. Stored energy
  7. 12. a greek philosopher who proposed the idea that heavens were composed of 55 concentric, crystalline spheres to which the celestial objects were attached and which rotated at different velocities
  8. 14. States any two bodies in the universe attracts each other with a force that is proportional to mass and distance
  9. 19. a small circle whose center moves around the circumference of a larger one
  10. 20. known as geocentrism, or the Ptolemaic system, it is the description of the cosmos where earth is at the orbital center of all celestial bodies
  11. 21. Italian astronomer who first used the telescope to observer stars
  12. 24. the process of combining 2 hydrogen atoms to form helium
  13. 25. The velocity required by a spacecraft or satellite to enter and maintain orbit
  14. 26. The energy of body has by virtue of its motion
Down
  1. 1. Time taken for an object to make a complete orbit around another object
  2. 2. Greek astronomer who believed all heavenly bodies revolved around earth
  3. 3. German astronomer who first accurately describe the elliptical orbits Earth and planets; also said planets closest to the sun move the fastest
  4. 5. Polish astronomer that accepted the idea that the earth and other planets revolved around the sun
  5. 8. the circle around the earth in which a celestial body of the center of the epicycle of it's orbit was thought to move
  6. 13. Celestial object consisting of ice and dust when where near the sun, a tail forms behind them
  7. 15. A measure of the non-circularity of an elliptical orbit
  8. 16. Danish astronomer who constructed instruments that he used to plot accurately the positions of the planets, sun, moon and stars
  9. 17. The point in the orbit of a planet or comet that is farthest from the sun
  10. 18. motion in the direction opposite to the movement of something else and the contrary of the direct prograde motion
  11. 22. A close is symmetric curve which the some of the distances of any point on in the lips from two fixed points (foci) the mains constant no matter where the point is
  12. 23. The axis the passes through both focuses of an ellipse