Astronomy Exam Review Crossword!

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