Space Vocabulary

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Across
  1. 6. Astronomer who believed in the heliocentric model of the solar system; used the telescope to prove heliocentric model; discovered Jupiter's four largest moons
  2. 7. Astronomer who believed in the geocentric model of the solar system; predicted the positions of the planets without technology
  3. 8. All of space and everything in it including stars, planets, galaxies, etc.
  4. 10. a galaxy whose arms curve outward in a pinwheel pattern
  5. 12. The idea that the sun is the center of the solar system
  6. 14. Astronomer who believed in the heliocentric model of the solar system; recorded the order/ positions of the planets.
  7. 15. The idea that Earth is at the center of the solar system.
  8. 17. A hug collection of stars, dust, and gas bound together by gravity
  9. 20. the sun and all of the planets and other bodies that travel around it
  10. 21. A galaxy that does not have a regular shape
  11. 23. the collection of more than 20 galaxies, including the Milky Way
  12. 24. Astronomer who believed in the geocentric model of the solar system; developed theory that Earth is a sphere
Down
  1. 1. The theory that the universe was created in a huge explosion that released all matter and energy.
  2. 2. the largest galaxy in the Local Group
  3. 3. the scientific law that states that every object in the universe attracts every other object
  4. 4. An elongated circle, or oval shape, the shape of the planets orbit.
  5. 5. A large spiral galaxy that is home to Earth and the rest of our solar system, and about a trillion stars.
  6. 9. A galaxy shaped that is round or oval in shape, generally containing only old stars
  7. 11. the distance light travels in one year (9.5 trillion kilometers)
  8. 13. A collection of hundreds and tens of thousands of galaxies held together by their mutual gravitational attraction.
  9. 16. where our Solar system is located in the Milky Way
  10. 18. an explanation of a natural phenomenon supported by many observations and experiments over time
  11. 19. Astronomer who developed the heliocentric model of the solar system; theorized that Earth rotates on it's axis once a day and revolves around the sun once a year.
  12. 22. Astronomer who believed in the heliocentric model of the solar system; discovered that the plants have elliptical orbits