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Across 2. involving different countries 6. to say that something is yours 8. someone trained to travel and work in space 10. the path one object takes as it travels around another object in space 14. something difficult to do 15. worth a great deal 16. tools used for a certain purpose 19. having or consisting of rocks 20. to increase in size 21. to make something less difficult or painful 22. thing, place, or person from which something comes

Down 1. the place to which someone or something is going 3. the use of scientific knowledge to invent or build things 4. something you aim for 5. very much; in a way that is far beyond normal 7. correct or right 9. ready to be used 11. to use again 12. something that takes up a lot of space 13. to discover or notice 15. something that carries people or goods 17. a plan for doing something 18. a device that shows changes in light, heat, or motion 19. to begin something again