Space crossword

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Across
  1. 2. The planet in the Solar system which is closest to the Sun (7)
  2. 5. Your _________, which is measured in kg, is the same on Jupiter and on Earth (4)
  3. 6. The variable which you change in an investigation (11)
  4. 7. Your _________, which is measured in Newton, is higher on Jupiter than on Earth (6)
  5. 8. The variables which you keep the same in an investigation (7)
  6. 9. The unit for measuring distances between galaxies (5-4)
Down
  1. 1. There is a _____________ force which pulls the Earth towards the Sun (13)
  2. 3. Planets which are found outside the Solar System (9)
  3. 4. The variable which you measure in an investigation (9)
  4. 5. Small rocks which orbit the Sun (9)