Unit 2

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Across
  1. 1. States that planets sweep out equal amounts of area in equal amounts of time. (Kepler's _______ Law of Planetary Motion)
  2. 3. States that there is a relationship between the orbital period of a planet and the distance that a planet travels in it's orbit. (Kepler's ___ Law of Planetary Motion)T^2=R^3
  3. 7. the Earth's motion of orbit around the Sun
  4. 8. occurs twice yearly (June & December) when the sun reaches its greatest distance north or south of the equator
  5. 9. elongated, closed curve with two foci
  6. 11. states that the Moon formed 4.6 billion years ago when a Mars-sized object collided with Earth.( Giant ______ Theory)
  7. 16. occurs twice yearly (March & September) when the sun is directly above the Earth's equator, and the number of daylight hours are equal to the number of nighttime hours, worldwide.
  8. 18. rocky solar system objects of widely varying size usually found between the orbits of Mars and Jupiter in an area called the asteroid belt
  9. 19. There is a force of attraction between any two objects in the universe. This force is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between them.(Newton's Universal Law of ________)
Down
  1. 1. because of the timing of Earths rotation & revolution the same side of the moon is always facing the Earth (hint _____ rotation)
  2. 2. point in a planet's orbit that is closest to the sun
  3. 4. sun-centered model of the solar system
  4. 5. States that all orbits are in the shape of an ellipse. (Kepler's ____ Law of Planetary Motion)
  5. 6. earth-centered model of the solar system
  6. 10. occurs when the Moon moves directly between the Sun and Earth and casts a shadow on part of the Earth (hint ___ ellipse)
  7. 12. other rocky solar system objects formed from pieces of comets and asteroids
  8. 13. the point in a planet's orbit that is farthest from the sun
  9. 14. mass of dust, rock particles, frozen water, methane, and ammonia that travels through space and develops a bright, distictive tail of light as it approaches the Sun and is pushed on by the solar wind
  10. 15. the spinning action of the Earth, allows us to experience days
  11. 17. occurs when the Earth's shadow falls on the Moon ( ___ eclipse)