Across
- 5. Newton's law states that all objects attract all other objects, and provides an explaination for the planets' elliptical orbits
- 8. A model of the universe that places Earth at the centre with the sun, moon, and planets revolving around it
- 9. A set of axes of any kind that is used to describe the positions or motion of things
- 12. Another name for placing Earth at the centre so that the sun, moon and planets revolve around it
- 14. A model of the universe that places at the centre with Earth, the planets and the moon revolving around it.
- 15. A device used to measure an object's azimuth
- 16. Determines the fineness of detail a telescope can produce of an object in view
- 17. Groupings of stars that form patterns, which appear like objects and are given names
- 18. The angle measured above the horizon in degrees when measuring altitude-azimuth co-ordinates
- 19. All objects seen in the sky (sun, moon, stars, and planets)
Down
- 1. A device used to measure the altitude of an object
- 2. Locate a celestial body relative to a fixed Earth (as though the celestial bodies are circling the Earth)
- 3. Celestial bodies in our solar system, including Earth, that orbits the sun
- 4. The lens through which you view a magnified object using a telescope
- 6. The large lens at the front of a telescope
- 7. To throw or bend back from a surface
- 10. Another name in which you can view objects that are magnified using a telescope
- 11. Another name for placing the sun at the centre with the planets and moon revolving around it
- 13. To deflect
- 20. A figure that looks like a squashed circle; planets in the solar system move in elliptical orbits around the sun
- 21. The angle measured clockwise from North when measuring altitude-azimuth co-ordinates