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