Space

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Across
  1. 4. all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy
  2. 6. the universe is theorised to have started at the Big
  3. 7. the sun is made up predominantly of Hydrogen and what other gas?
  4. 9. the closest planet to the sun
Down
  1. 1. the largest planet and closest gas giant to the sun
  2. 2. the distance light can travel in one year is called a light ....
  3. 3. the planet furthest from the sun
  4. 5. a gravitationally bound system of stars, stellar remnants interstellar gas, dust, and dark matter
  5. 8. the star at the centre of our solar system
  6. 9. the galaxy that includes our Solar System is the ..... way