Across
- 1. one revolution of a planet
- 5. made up of the sun and all the objects that move around it
- 7. piece of rock that is smaller than an asteroid
- 8. large pieces of space rock that do not have regular shapes
- 10. a large round body in space that moves around a star
- 11. a piece of space rock that lands on Earth's surface
- 14. an imaginary line that divides Earth into hemispheres
- 15. on rotation of a planet
- 18. any object that revolves around another object
- 19. huge ball of hot gases that gives off its own light
- 20. curved path along which a planet or other space body moves
- 21. a group of parts that work together
- 24. to move in a path around another object
- 25. repeating set of shapes or events
Down
- 2. an imaginary line that runs from the north pole to south pole
- 3. a scientist who studies space
- 4. half of Earth
- 5. a spacecraft that carries tools but not human crew
- 6. a space body made up of ice, dust, and small rock particles
- 9. first spacecraft launched into space in 1957
- 11. sometimes called a shooting star
- 12. a tool that makes objects that are far away appear closer
- 13. series of changes that happen over and over in the same way
- 16. part of the year with certain predictable weather patterns
- 17. something that stands for a real object or system
- 22. a force that pulls all objects toward each other
- 23. a natural object that moves in an orbit around a planet
- 26. to spin on an axis