Across
- 2. The star that the Earth orbits
- 4. The force of attraction between any two objects.
- 7. A natural satellite of a planet
- 8. A huge ball of gas that gives out heat and light.
- 9. The path that a planet takes around a star, or the path that a moon or satellite takes around a planet.
- 10. A cluster of billions of stars, held together by gravity.
- 11. The amount of matter an object contains.
- 12. How fast something is moving measured in metres per second, ms-1
- 13. The time it takes for a planet to spin once on its axis. This takes 24 hours on Earth.
- 14. The units of force.
- 15. The galaxy that our Solar System is in.
Down
- 1. 29 days – the time it takes the Moon to orbit the Earth once
- 3. The force acting on an object due to the pull of gravity from a massive object like a planet.
- 5. The length of time it takes a planet to go around the sun once.
- 6. A planet that orbits a star, which is not our Sun
- 8. A star with planets and other objects orbiting it.