Across
- 4. study of space and cellestial objects
- 5. dwarf planet
- 7. region of the sun where nuclear fission takes place
- 9. movement of an object about its own axis
- 12. a manmade/natural object that revolves around something else
- 14. an imaginory pattern in the sky
- 15. event where moon blocks sun
- 17. chunk of rock broken off from an asteroid
- 19. model of universe with earth as centre
- 20. name of first animal in space
Down
- 1. force that pulls objects towards each other
- 2. closest planet to the sun
- 3. _______ unit = 149,597,871 kms
- 6. the path an object takes
- 8. minimum velocity required by rocket to fly beyond a planet's gravity
- 10. study of effect of stars on people's lives
- 11. rocky planets are also called these planets
- 13. imaginary line joining sky and ground
- 16. chunk of frozen matter travelling in the space
- 18. small object that revolves around planet