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  1. 3. an Egyptian astronomer, mathematician, and geographer of Greek descent
  2. 4. model any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all.
  3. 5. each of the four divisions of the year (spring, summer, autumn, and winter) marked by particular weather patterns and daylight hours, resulting from the earth's changing position with regard to
  4. 6. solar system consists of our star, the Sun, and everything bound to it by gravity big bang theroy the universe as we know it started with an infinitely hot and dense single point that inflated and stretched
  5. 8. equinox the equinox in autumn, on about September 22 in the northern hemisphhe and March 20 in the southern hemisphere.
  6. 10. the action of rotating around an axis or
  7. 14. a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light
  8. 16. Milky Way is a huge collection of stars, dust and gas.
  9. 17. is a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
  10. 18. a period of drastic change in scientific thought that took place during the 16th and 17th centuries.
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  1. 1. are large objects made of dust and ice that orbit the Sun.
  2. 2. Polish astronomer who promulgated the now accepted theory that the earth and the other planets move around the sun
  3. 4. acctaction the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.
  4. 7. model the astronomical model in which the Earth and planets revolve around the Sun at the center of the universe.
  5. 9. solstice The summer solstice occurs during summer
  6. 11. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution
  7. 12. a small rocky body orbiting the sun
  8. 13. of earth angle between an object's axis of rotation and its orbital axis, perpendicular to the orbital plane
  9. 15. galaxy a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.