Universe crossword

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Across
  1. 4. The galaxy that includes our solar system
  2. 6. Occurs when two nuclei combine to form a new nucleus
  3. 8. Based on the temperature of the star
  4. 9. A cloud of gas and dust in outer space
  5. 10. All space and time and their contents
Down
  1. 1. A scatter plot of stars showing the relationship between stars' luminosity and temperature
  2. 2. Brightness
  3. 3. Having a flat circular shape
  4. 5. A change in the identity or characteristics of an atomic nucleus
  5. 7. A system of millions or billions of stars