Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 2. Cosmonauts feel this while in orbit 4. Gravity forces are very ____ compared to electrical forces 5. Orbits a planet 6. Change in velocity divided by time interval 11. Centripetal force acts towards the centre of the ______ 13. This results in acceleration 15. Gravity is ________ 16. Speed in a direction 17. Range of gravity 18. An orbiting satellite is constantly ________ towards the planet

Down: 1. Orbits once every 24 hours 3. RATS (anag) 7. Force in circular motion 8. Path of planet round a star 9. Orbit of monitoring satellite 10. Large orbiting objects 12. Holds a planet in orbit to its star 14. Velocity changes because ________ changes