Honors Earth Science Vocab

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Across
  1. 2. Stored energy
  2. 5. Polish astronomer that accepted the idea that the earth and other planets revolved around the sun
  3. 12. The point in the orbit of a planet or comet that is farthest from the sun
  4. 14. Italian astronomer who first used the telescope to observer stars
  5. 17. motion in the direction opposite to the movement of something else and the contrary of the direct prograde motion
  6. 20. Celestial object consisting of ice and dust when where near the sun, a tail forms behind them
  7. 21. A unit of astronomical distance equivalent to the distance light travels in one year
  8. 22. The energy of body has by virtue of its motion
  9. 23. The axis the passes through both focuses of an ellipse
  10. 24. the process of combining 2 hydrogen atoms to form helium
  11. 25. the circle around the earth in which a celestial body of the center of the epicycle of it's orbit was thought to move
Down
  1. 1. The velocity required by a spacecraft or satellite to enter and maintain orbit
  2. 3. 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
  3. 4. 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
  4. 5. States any two bodies in the universe attracts each other with a force that is proportional to mass and distance
  5. 6. A measure of the non-circularity of an elliptical orbit
  6. 7. a cloud of gas and dust in outer space
  7. 8. Greek astronomer who believed all heavenly bodies revolved around earth
  8. 9. a great circle representing the sun's path during the year
  9. 10. Measurement with the sun in the center
  10. 11. The smaller of the two axes of an ellipse
  11. 13. German astronomer who first accurately describe the elliptical orbits Earth and planets; also said planets closest to the sun move the fastest
  12. 15. Time taken for an object to make a complete orbit around another object
  13. 16. a small circle whose center moves around the circumference of a larger one
  14. 18. Danish astronomer who constructed instruments that he used to plot accurately the positions of the planets, sun, moon and stars
  15. 19. 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