Space Crossword

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Across
  1. 2. The largest planet in the Solar System
  2. 3. A cloud of gas and dust in outer space.
  3. 5. The element formed by the fusion of two hydrogen nuclei.
  4. 6. A natural satellite that orbits the earth.
  5. 9. The attractive force that keeps the planets in orbit around the sun.
  6. 11. The collapse and explosion of a supergiant star.
Down
  1. 1. The planet that is farthest from the sun.
  2. 4. The nuclear process that happens in the core of a star.
  3. 7. The unit for weight (the force of gravity).
  4. 8. The planet closest to the sun
  5. 10. The amount of matter in a body, measured in kilograms.