Space terms

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Across
  1. 5. this happens to stars that can no longer produce enough energy.
  2. 6. There are ________ planets in the solar system.
  3. 8. What is the theory scientists came up with for how the universe started?
  4. 10. very small objects in space.
  5. 12. Galaxy with a disk like shape.
  6. 13. the theory that states the universe will expand to maximum then contract.
  7. 15. Name for spread out cloud of dust and gas .
  8. 16. the study of the origin and changes of the universe.
  9. 18. Which planet is similar in size to Earth?
Down
  1. 1. asteroids, meteors, and comets are examples.
  2. 2. What separates Mars and Jupiter?
  3. 3. Supernovas are basically ________.
  4. 4. New stars are often bright blue or_________in colour.
  5. 7. how many years does a medium-mass star live?
  6. 9. Black holes are______.
  7. 11. a ________ is a name of a neutron star.
  8. 14. All living organisms are made of _______ and other molecules.
  9. 17. The outer planets are made of_______.