Universe

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