Astronomy Review

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Across
  1. 2. The main "fuel" for stars.
  2. 4. The force that contracts dust and gas to form a star.
  3. 5. The 4 outer planets in our solar system
  4. 7. A small frozen mass that travels around the sun
  5. 10. Planet with the smallest mass in our solar system
  6. 11. The second planet closest to the Sun.
  7. 13. The life stage after Main Sequence for a massive star.
  8. 14. Stars with the highest temperatures have this color.
  9. 16. brightness
  10. 17. A small celestial object that orbits a planet.
  11. 18. A ball of gas that produces its own light energy through nuclear fusion.
Down
  1. 1. The leftover radiation from the Big Bang is known as cosmic ___ background radiation.
  2. 3. Made up of billions of stars.
  3. 6. A cloud of dust and gas in which stars form.
  4. 8. This characteristic of stars that determines whether it will go supernova.
  5. 9. The 4 inner planets in our solar system
  6. 12. Planet with the lowest density in our solar system.
  7. 15. Nuclear fusion happens in a star's ____.