Astronomy Exam Review Crossword!

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