Astronomy Exam Review Crossword!

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Across
  1. 6. An optical instrument designed to make distant objects appear nearer.
  2. 8. Used the sky to plant crops, harvest crops, change of seasons, etc...from the sky
  3. 10. The time it takes for the Earth to revolve around the Sun
  4. 12. a telescope that uses lenses to enlarge an image
  5. 17. latin for cloud. Filled with gas and dust in space
  6. 18. scientists who study the universe
  7. 21. Determined all objects in the universe attract each other through gravitational force
  8. 22. Credited for recording very precise observations of planets and stars that helped future astronomers
  9. 23. The distance light travels in one year
  10. 27. the biggest type of galaxy with a lot of "stuff" in the middle and are shaped like a football
  11. 28. Believed the Earth was the center of the universe
  12. 29. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  13. 30. the phenomenon that causes heat and pressure to increase inside a cooling nebula
  14. 31. a galaxy with no defined shape
Down
  1. 1. Came up with three planetary laws of motion that are still used today. Assistant to Brahe
  2. 2. A person who studies astronomy.
  3. 3. To spin on an axis
  4. 4. The brightness and/or strength of a star
  5. 5. Imaginary shapes or outlines of mythological creatures, people/gods, and/or animals.
  6. 7. Hot spheres of gas and dust in space of all different magnitudes
  7. 9. The time it takes for the Earth to spin once on its axis
  8. 11. To move in a circular orbit around
  9. 13. One of the first people to use a telescope to observe space. Discovered craters on the moon and four of Jupiter's moons.
  10. 14. Believed the Sun was the center of the universe
  11. 15. The time it takes for the moon to revolve around the Earth
  12. 16. The science of the universe
  13. 19. Responsible for proving that other galaxies existed beyond of Milky Way
  14. 20. Our galaxy
  15. 24. a telescope that uses mirrors to enlarge an image
  16. 25. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
  17. 26. A very dense area so strong that nothing can escape, not even light.