Astronomy Vocabulary

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Across
  1. 5. planets similar to Jupiter, large gas and low density
  2. 7. model of the solar system with the Earth at the center
  3. 8. the shortest type of electromagnetic radiation
  4. 12. the galaxy that we live in
  5. 14. young average stars like the sun
  6. 15. a change in wavelength caused by movement
  7. 17. everything known to exist
  8. 18. a spherical object that orbits a star
  9. 19. when a star moves towards us and its wavelengths are closer together
  10. 20. hydrogen molecules combine to make helium and release energy
Down
  1. 1. the brightness of a star compared to the sun
  2. 2. the cloud of gas and dust that stars form in
  3. 3. a collection of gravitationally bound stars
  4. 4. planets similar to earth, small rocky and dense
  5. 6. the idea that the universe began as a single point 13.7 billion years ago
  6. 9. this object orbits the Earth in both the geocentric and heliocentric model of the solar system
  7. 10. the star closest to the earth
  8. 11. when a star moves away from us and its wavelengths are further apart
  9. 13. gas and dust combining together into larger and larger pieces
  10. 16. model of the solar system with the Sun at the center