The Universe

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Across
  1. 1. The brightest object in our sky
  2. 5. The last four planets are made of these
  3. 6. This theory suggests the Universe will stop expanding and collapse into a hot dense ball of matter
  4. 7. The satellite that can observe the history of the Universe
  5. 9. Measurement based on the distance between the Sun and the Earth
  6. 13. Clumps together in spider like structures
  7. 16. We use this when we are dealing with very small or very large numbers
Down
  1. 2. 78% of our atmosphere is made up of this
  2. 3. A measurement based on the distance a light travels through a vacumm in one year
  3. 4. A crucial piece of evidence for the Big Bang Theory
  4. 7. The first stage in a star's formation
  5. 8. Small bodies believed to be left over from the beginning of the Universe
  6. 10. Refers to stars roughly the size of our sun
  7. 11. This theory suggests that our Universe started from a simgle point and has been expanding ever since
  8. 12. A high mass star may turn into this
  9. 14. Small icy bodies that give off gas and dust as they pass by
  10. 15. The first four planets are made of these