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Across 1. change in velocity 3. extreme variation in space due to sun exposure or shade 4. movement around a point, like a natural satellite 5. material used by astronauts to reduce the effects of radiation 6. the force pushing the exhaust gases out of the rocket 9. how you feel if there is no gravity 11. becomes weakened because of a lack of exercise 14. speed in a particular direction 15. long term space craft orbiting the earth

Down 1. a human travelling in space 2. travel between planets 7. type of radiation that damages body cells 8. the force pushing the rocket into space 10. becomes weakened in space as it does not need to pump as hard 12. force of attraction of an object on another object 13. cosmic radiation is made of these high speed particles