Space crossword

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Across
  1. 3. a massive ball of extremely hot gas, which is mainly hydrogen
  2. 4. a giant cloud of mainly hydrogen gas and dust in space
  3. 6. occur because the Earth is tilted on its axis and it is orbiting the Sun.
  4. 10. the time it takes for a planet to spin once on its axis.
  5. 13. groups of stars
  6. 15. a non-contact force that acts between two masses
Down
  1. 1. a rocky body orbiting Earth.
  2. 2. is a measure of the amount of matter in an object
  3. 5. is a large lump of metals and rock that orbits the Sun
  4. 7. system the sun and the planets in orbit around it
  5. 8. a huge collection of gas, dust, and billions of stars and their solar systems
  6. 9. eclipse when the Earth comes between the sun and the moon
  7. 11. a smaller lump of ice, dust and rocky material that orbits the Sun.
  8. 12. the size of the force of gravity acting on an object
  9. 14. a rocky inner planet, fourth from the Sun