Universe

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Across
  1. 4. The explosion that started the Universe
  2. 6. A system that includes the Sun, planets, and other celestial objects
  3. 9. Our home planet
Down
  1. 1. The galaxy that contains our solar system
  2. 2. A place with mostly empty space but full of stars and planets
  3. 3. A huge group of stars, gas, and dust held together by gravity
  4. 5. The natural satellite of Earth
  5. 7. A massive ball of hot gas that produces light and heat
  6. 8. The star at the center of our solar system