Unit 1 Vocabulary

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Across
  1. 7. having or representing the sun as the center
  2. 8. a system of millions or billions of stars, together with gas and dust,
  3. 10. having or representing the earth as the center
  4. 12. hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune
  5. 13. Planet Earth-like planets made up of rocks or metals with a hard
  6. 14. a celestial body moving in an elliptical orbit around a star.
  7. 16. all existing matter and space considered as a whole
  8. 18. together by gravitational attraction.
  9. 19. high density and temperature.
  10. 20. Planet a celestial body resembling a small planet but lacking certain
Down
  1. 1. Way the galaxy in which we live that contains the stars that make up
  2. 2. Milky Way.
  3. 3. and comets
  4. 4. criteria that are required for it to be classed as such.
  5. 5. the sun, a tail of gas and dust particles pointing away from the sun.
  6. 6. Bang theory that describes how the universe expanded from an initial state
  7. 9. small rocky objects that orbit the Sun.
  8. 10. giants a large planet of relatively low density consisting predominantly
  9. 11. a celestial object consisting of a nucleus of ice and dust and, when
  10. 15. the sun, together with smaller bodies in the form of asteroids,
  11. 17. System the collection of eight planets and their moons in orbit