Space Crossword Puzzle

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Across
  1. 3. type of galaxy that lacks a central nucleus and is brighter in the center
  2. 4. magnified the telescope by 30 times
  3. 5. type of galaxy that has a flat, spinning disk with a central nucleus surrounded by spiral arms
  4. 7. model with the earth in the center of the solar system- Ptolemy
  5. 10. seventh planet from the sun and spins on its side
  6. 11. the Greek word the name of our solar system comes from
  7. 12. all of space, time, and their contents
  8. 15. name of our galaxy
  9. 16. a gravitationally bound system of stars, pieces of stars, gas, dust, and dark matter
  10. 17. contains more than 99.85% of the total mass of the solar system
  11. 18. the tendency of an object to stay either at rest or in motion along a straight path
Down
  1. 1. type of galaxy that has an unusual shape, size, or composition.
  2. 2. model with the sun in the center of the solar system- Copernicus
  3. 6. fifth planet from the sun and is the largest
  4. 8. type of galaxy that has no definite shape.
  5. 9. is a gravitationally bound system of the sun and the objects that orbit it.
  6. 13. In 1687, argued that the orbit of the moon depended on the same type of force that causes an apple to fall on Earth
  7. 14. the force that pulls all objects towards each other