Astronomy

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Across
  1. 3. An orbit where a satellite stays above the same point on the Earths surface
  2. 7. The next stage in the life cycle of our sun
  3. 10. One of the final stages of a massive star
  4. 11. Cosmic _______ background
  5. 13. The nuclear reaction that happens inside stars
  6. 14. The theory supported by CMB
  7. 16. Model of the solar system with the Earth at the centre
  8. 18. The energy stored in a nebula
Down
  1. 1. Model of the solar system with the sun at the centre
  2. 2. Scientist who discovered moons orbiting Jupiter
  3. 4. The age of the universe (bn of years) according to the big bang theory
  4. 5. A quantity that constantly changes for an orbiting objec
  5. 6. Stars form from these
  6. 8. A key quantity that the steady state theory claims stays the same
  7. 9. Shape of most orbits
  8. 12. Small, rocky object in our solar system
  9. 15. When a massive star explodes
  10. 17. This happens to the light from galaxies moving away from an observer