Universe

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Across
  1. 4. Massive clouds of dust and gas which stars can form
  2. 5. Most stars are in a stage called the main _____
  3. 8. The common fuel of stars
  4. 9. An object that orbits planets
  5. 10. The force that balance out the gas pressure in stars
  6. 12. The closest star in Earth
Down
  1. 1. The reaction that stars perform to create energy
  2. 2. A system of millions or billions of stars
  3. 3. What is temperature plot against in a HR diagram?
  4. 6. The farthest known planet from the Sun
  5. 7. The elliptical path of an object around a point in space
  6. 11. Second brightest object in the night sky